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Royal Commission on Animal Magnetism

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The Royal Commission on Animal Magnetism involved two entirely separate and independent French Royal Commissions, each appointed by Louis XVI in 1784, that were conducted simultaneously by a committee composed of four physicians from the Paris Faculty of Medicine (Faculté de médecine de Paris) and five scientists from the Royal Academy of Sciences (Académie des sciences) (i.e., the "Franklin Commission", named for Benjamin Franklin), and a second committee composed of five physicians from the Royal Society of Medicine (Société Royale de Médecine) (i.e., the "Society Commission").

Each Commission took five months to complete its investigations. The "Franklin" Report was presented to the King on 11 August 1784 – and was immediately published and very widely circulated throughout France and neighbouring countries – and the "Society" Report was presented to the King five days later on 16 August 1784.

The "Franklin Commission's" investigations are notable as a very early "classic" example of a systematic controlled trial, which not only applied "sham" and "genuine" procedures to patients with "sham" and "genuine" disorders, but, significantly, was the first to use the "blindfolding" of both the investigators and their subjects.[1][2][3]

"The report of the ["Franklin"] Royal Commission of 1784 . . . is a masterpiece of its genre, and enduring testimony to the power and beauty of reason. . . . Never in history has such an extraordinary and luminous group [as the "Franklin Commission"] been gathered together in the service of rational inquiry by the methods of experimental science. For this reason alone the [Report of the "Franklin Commission"] . . . is a key document in the history of human reason. It should be rescued from obscurity, translated into all languages, and reprinted by organizations dedicated to the unmasking of quackery and the defense of rational thought." – Stephen Jay Gould (1989).[4]

Both sets of Commissioners were specifically charged with investigating the claims made by Charles d’Eslon for the existence of a substantial (rather than metaphorical) "animal magnetism", "le magnétisme animal", and of a similarly (non-metaphorical) physical "magnetic fluid", "le fluide magnétique". Further, having completed their investigations into the claims of d'Eslon[5] – that is, they did not examine Franz Mesmer, Mesmer's theories, Mesmer's principles, Mesmer's practices, Mesmer's techniques, Mesmer's apparatus, Mesmer's claims, Mesmer's "cures" or, even, "mesmerism"[6] itself – they were each required to make "a separate and distinct report".[7]

"Before the ["Franklin" Commission's] investigations began, [Antoine Lavoisier] had studied the writings of d'Eslon and [had] drawn up a plan for the conduct of the inquiry. He decided that the commissioners should not study any of the alleged cures, but [that] they should determine whether animal magnetism existed by trying to magnetize a person without his knowledge or making him think that he had been magnetized when in fact he had not. This plan was adopted by the commissioners, and the results came out as Lavoisier had predicted." – Frank A. Pattie (1994).[8]

From their investigations both Commissions concluded (a) that there was no evidence of any kind to support d'Eslon's claim for the substantial physical existence of either his supposed "animal magnetism" or his supposed "magnetic fluid", and (b) that all of the effects that they had observed could be attributed to a physiological (rather than metaphysical) agency. Whilst each Commission implicitly accepted that there was no collusion, pretence, or extensive subject training involved on the part of d'Eslon, they both (independently) concluded that all of the phenomena they had observed during each of their investigations could be directly attributed to "contact",[9][10] "imagination",[11] and/or "imitation".[12]

"For clearness of reasoning and strict impartiality [the "Franklin" Commissioners' report] has never been surpassed. After detailing the various experiments made, and their results, they came to the conclusion that the only proof advanced in support of Animal Magnetism was the effects it produced on the human body – that those effects could be produced without passes or other magnetic manipulations – that all these manipulations, and passes, and ceremonies never produce any effect at all if employed without the patient's knowledge; and that therefore imagination did, and animal magnetism did not, account for the phenomena." – Charles Mackay (1841, emphasis added to original).[13]

Reasons for the investigation

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King Louis XVI (1776)
Marie Antoinette
Chancellor von Kaunitz
Princess of Lamballe
Jean-Frédéric Phélypeaux, the French Minister of State
The execution of King Louis XVI
The execution of Marie Antoinette
"The rise of mesmerism [was] symptomatic of several philosophical and psychological conflicts: spirit/mind vs. body; science and philosophy vs. psychology and the imagination; rationalism and empiricism vs. the irrational and unknown; [and] consciousness vs. the unconscious" (Faflack, 2009, p. 53).

According to Armando & Belhoste (2018, pp. 6–8), the true history of Mesmer, of Mesmer's version of 'animal magnetism', and of the rationale, conduct, investigations, experimentation, and findings of the 1784 Royal Commissions has been seriously distorted by the modern ("cherry picking") concentration upon "the transformations of animal magnetism after 1820 [in relation to] hypnotism",[14] and, especially, upon "the elements of continuity and analogy between mesmerism [sic] the various versions of psychoanalysis".[15]

Consequently, to accurately understand the contemporary significance of the Commissions' work, and the matters that they severally and collectively examined (and, as well, those which they did not) it is important to identify the wide range of significant tensions, disputes, and circumstances prevailing at the time, which prompted the need for an official investigation of the particular nature and type that was undertaken, and the sort of (implicit) issues – in addition to the more specific questions of medicine and of science – that their inquiries would, hopefully, address.

Moreover, in order to gain a balanced understanding of the contemporary significance of the Commissions – as stand-alone historical events – appointed at a specific time, in specific circumstances, with specific goals and, further, in order to apprehend the nature of their investigations, their findings, and the immediate consequences of their reports, a complex of different factors need to be examined (as has been suggested by Craver & Darnden, 2013):

"From the perspective of a given phenomenon, one can look down to the entities and activities composing it. One can look up to the higher-level mechanisms of which it is a component. One can look back to the mechanisms that come before it or by which it developed. One can look forward to what comes after it. [And, finally] one can look around to see the wider context with which it operates." (p. 163)

Tensions within the Royal family

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Prior to his arrival in Paris in 1777 – with a letter of recommendation from Chancellor von Kaunitz of the Habsburg monarchy to the Austrian Ambassador to France, the Comte de Mercy-Argenteau (who, in turn, introduced Mesmer to Jean-Baptiste Le Roy (1720–1800), the Director of the Academy of Sciences) – Mesmer was already known to Marie Antoinette.[16]

At the urging of her two closest friends, Marie-Paule Angélique d’Albert de Luynes (1744–1781), "the Duchesse de Chaulnes" and Marie Thérèse Louise de Savoie-Carignan (1749–1792), "the Princess of Lamballe", both of whom "had benefited from Mesmer's treatment", Marie Antoinette had been able to arrange for both Mesmer and d'Eslon to be officially "interviewed" by (an otherwise unidentified) representative of the King on 14 March 1781 (Walmsley, 1967, p. 267). At the conclusion of the interview, Mesmer reluctantly agreed to the proposed conditions: that a number of his (previous and current) patients be examined by a team of "commissioners" – it was also stipulated that, as a "requirement" of the King, Mesmer was to "remain in France", until his "doctrines" and his "principles" had been thereby "established", and that he was "not [to] leave except by permission of the King" – and that, if the commissioners' reports were "favourable", the government would issue "a ministerial letter" to that effect (Pattie, 1994, p. 110).

Within two weeks Mesmer had rescinded his agreement, on the grounds that it had been made under duress,[17] and a new "interview" was conducted, involving Mesmer, d'Eslon, the unidentified bureaucrat, and the Minister of State, Jean-Frédéric Phélypeaux de Maurepas.

"The Minister . . . began by saying that the King, informed of Mesmer's dislike of being investigated by commissioners, wished to excuse him from that formality and would grant him a life annuity of 20,000 French livres and pay 10,000 livres a year for the instruction of students, of whom three were to be selected by the government. "The rest of the benefits would be granted when the government's students recognize the utility of the discovery"." (Pattie, 1994, p. 111).

Once again, Mesmer rejected the offer made on behalf of the King; and, having been told that the King's decision was final, and given that the impetus for the first interview had come from the Queen, Mesmer wrote an extraordinary letter (translated at Pattie, 1994, pp. 112–115), the nature of which would have meant imprisonment in the Bastille, if it had been written 20 years earlier.

"Meditating [on the Minister's use of the word "final",] Mesmer returned to his clinic and put his name to what would surely be one of the most extraordinary letters ever written to a queen of France [who also shared his "native land"] even if he had sent it privately. Instead, he had it printed, [be]rating her in public about the offer [that had been] made in her name and giving her an ultimatum."[18]

So, there were many reasons for the 1784 Commission to satisfy the (French) interests of the King, rather than the (Austrian) interests of his queen.

Social impact

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It is already more than six years since Animal Magnetism was announced to Europe, particularly in France and in this Capital. But it is only over about the last two years that it has been of particular interested to a considerable number of citizens and that it has become the object of public discussion. Never had a more extraordinary question divided the opinions of an enlightened nation. – The Franklin Commission's Report to the Royal Academy of Sciences (September 1784, emphasis added)[19]

Mesmer's overall stress on the quest for "harmony" as a therapeutic outcome and, especially, given the demonstrated fact that the effects of his 'animal magnetism' – predicated upon the presence of a force analogous to gravity – were equally demonstrated by all, regardless of age, gender, class, race, intellect, etc.,[20] was an important influence on many of the moves (and 'movers') within French society towards democracy and greater equality.[21][22]

Festering political issues

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The increasingly unpopular "Ancien Régime" was under considerable pressure from many quarters; and, within five years of the Commissions' Reports, the French Revolution had broken out. The storming of the Bastille took place on 14 July 1789; and four years later, King Louis XVI was executed on 21 January 1793, and his Queen, Marie Antoinette, the daughter of Empress Maria Theresa, and the sister of Emperor Joseph II, was executed on 16 October 1793.

Professional tensions

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Apart from the wider issue of having to evaluate and decide how to deal with those within the medical profession "who saw animal magnetism as an interesting therapeutic resource" (Armando & Belmonte, 2018, p. 13) – namely, the boundary disputes between the conventional therapeutic practices of the sorts that Brockliss and Jones (1997) usefully identify as lying within the established "medical penumbra" (pp. 230–283) and the novel and innovative practices at the "frontier" that were (potentially) responsible for the "expansion of the medicable" (pp. 441–459) – there were also significant tensions, differences, and boundary disputes between the more theory- and principle-centred Paris Faculty of Medicine (formed some five centuries earlier), and the more practitioner-centred Royal Society of Medicine (formed just 5 years earlier), the "primary function" of which was "to evaluate patent medicines and, by extension, new forms of therapy" (Forrest, 1999, pp. 18–19).

Scientific issues

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In a prevailing atmosphere of "[an overall] redefinition of frontiers in the legitimacy of knowledge" – and, in relation to Mesmer's claims, a redefinition "which did not necessarily match the public popularity that they attracted" (Zanetti, 2018), p. 59) – the issue of the existence (or not) of a substantial "magnetic fluid" and/or "animal magnetism" required resolution.

Medical issues

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At a time when, in relation to "healers and healing", the conglomerate of "physicians, empirics, surgeons, apothecaries, folk healers, and religious personalities all vied with each other (as well as worked together) for medical legitimacy and patients" (Broomhall, 2004, p. 5), Mesmer was not only a "foreign national",[23][24] but also one that had no affiliation of any kind with any known professional medical association within France (or elsewhere in Europe); and, as a consequence, his professional conduct, his medical practice, his medico-commercial enterprises, and his therapeutic endeavours were not regulated in any way.

Moreover, the efficacy of Mesmer's interventions had never been objectively tested, neither the agency nor the (pre- and post-intervention) veracity of his supposed "cures" had ever been objectively verified, and, finally, in relation to the presenting conditions of those with (supposedly) 'real' ailments, the question of whether the pre-intervention conditions of each case were of "organic" or "psychogenic" origins had never been objectively determined.

Religious issues

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As discussed at considerable length by Spanos and Gottlieb (1979) there were not only a wide range of controversial secular and religious issues relating to the similarities and differences between the induction, manifestations, and immediate and long-term consequences of the "crises" that were (sporadically) produced by the 'magnetic' interventions, and the exorcisms of the Roman Catholic Church, but, also, of greater significance, to the occasional (apparently veridical) reports of post-magnetic "clairvoyance"[25] – a condition that was one of the classic indications for an exorcism whenever it was considered to be "demonically inspired" (as distinct from those cases in which it was considered to be "divinely inspired" (Spanos and Gottlieb, 1979, p. 538)).[26][27][28]

The two Commissions

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Baron de Breteuil (c.1787)

The Commissions were appointed in early 1784 by the Baron de Breteuil, Secretary of State for the King's Household and Minister of the Department of Paris at the command of King Louis XVI.[29]

"At length [the matter of Animal Magnetism] was thought to deserve the attention of government, and a committee, partly physicians, and partly members of the royal academy of Sciences, with doctor Benjamin Franklin at their head, were appointed to examine it. M. Mesmer refused to have any communication with these gentlemen; but M. Deslon, the most considerable of his pupils, consented to disclose to them his principles, and assist them in their enquiries." – William Godwin (1785).[30]

"Franklin Commission"

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Benjamin Franklin, 1778

The first of the two Royal Commissions, usually referred to as the "Franklin Commission", was appointed on 12 March 1784.

It was composed of four physicians from the Paris Faculty of Medicine – the physician and chemist Jean d'Arcet, the physician and close friend of Franklin, Joseph-Ignace Guillotin(1738–1814),[31] the Hôtel-Dieu physician, Michel-Joseph Majault (1714–1790),[32] and the Professor (of physiology and pathology) Charles Louis Sallin – and, at the request of those four physicians,[33] five scientists from the Royal Academy of Sciences – the astronomer (and first mayor of Paris) Jean Sylvain Bailly(1736–1793), the geographer, cartographer, and former governor of St. Domingue, Gabriel de Bory de Saint-Vincent (1720–1801) [fr], Benjamin Franklin (1706–1790), the chemist and biologist Antoine Lavoisier (1743–1794), and the physicist (and expert on things electrical), Jean-Baptiste Le Roy, the Director of the Academy of Sciences.

"If the effects of magnetism . . . can be as well explained by the effects of an excited or exalted imagination, all the efforts of the Commissioners must be directed to distinguishing in "magnetism" . . . [per medium of] a single conclusive experiment [viz., une seule expérience concluante] . . . those things that are related to physical causes [viz., causes physiques] from those that are related to [psychological] causes [viz., causes morales], [that is,] the effects of a real agent [viz, les effets d'un agent réel] from those due to the imagination. . . .
By magnetising people without their knowledge and by persuading them that they are being magnetised when they are not . . . one will obtain separately the effects of magnetism and those of the imagination and, from this, one will be able to conclude what should be attributed to the one and what to the other." – Antoine Lavoisier (1784).[34][35]

It is important to note that, despite the contemporary and modern salience given to Benjamin Franklin – who, as the most eminent of the commission's eleven members, was recognized as its titular head[36] – it is a matter of record that Franklin, now aged 78, and otherwise engaged in his duties as the U.S. Ambassador to France, had little involvement in any of the commission's investigations. In particular, this was because his own ill-health prevented him from leaving his residence in Passy and participating in the Paris-centred investigations[37][38] – although the commission's Report does note that several experiments were conducted at Franklin's Passy residence in Franklin's presence.[39]

In addition to his general scientific interests in electricity and (terrestrial) magnetism, "Franklin had known Mesmer for some years prior to the investigation and was familiar with the practice of animal magnetism",[40] and, on occasion, he and Mesmer had even "dined together" – and, also there was "no doubt [that] Franklin's curiosity was aroused by the mere connotation of the term animal magnetism, for it implied something in connexion with electricity, and [Franklin] himself had already made [25 years earlier] a number of experiments on the effect of electric discharges on paralytics, epileptics, etc." (Duveen & Klickstein, 1955, p. 287).[41][42]

"Society Commission"

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Charles-Louis-François Andry (1741–1829)

The second of the two Royal Commissions, usually referred to as the "Society Commission", was appointed on 5 April 1784.

It was composed of five eminent physicians from the Royal Society of Medicine – the physician and one of the first members of the Royal Society, Charles-Louis-François Andry (1741–1829) [fr] – and, as Pattie remarks (1994, p. 156), "the impression given by [their] report is that the commissioners were busy practitioners who wanted to devote no more time to the project than was necessary".

Although the investigations of the "Society Commission" were less thorough and less detailed than those of the "Franklin Commission" they were essentially of the same nature, and it is a matter of fact that neither Commission examined Mesmer's practices – they only examined the practices of d'Eslon.[45]

Franz Mesmer

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Franz Mesmer c.1800
Title page of Mesmer's (1766) dissertation
Mesmer's Précis Historique (1781)
Mesmer's Mémoire (1799)

Franz Anton Mesmer (1734–1815), born in Swabia, having first studied law at Dillingen and Ingolstadt universities, transferred to the University of Vienna and began a study of medicine, graduating Medicinae Doctor (M.D.) at the age of 32, in 1766: his doctoral dissertation (Mesmer, 1766) had the official title A Physico-Medical Dissertation on the Influence of the Planets.[46][47][48]

Although he was made a member of the Bavarian Academy of Sciences and Humanities in 1775,[49] and, despite his M.D. qualification, there is no record of Mesmer ever having been accepted as a member of any medical "learned society" anywhere in Europe at any time.

Mesmer left Austria in 1777, in controversial circumstances, following his treatment of the young Austrian Pianist Maria Theresia von Paradis for her blindness, and established himself, in Paris, in February 1778. He spent several years in Paris itself – during which time he published his Précis Historique (i.e., Mesmer, 1781)[50] – interspersed with time spent in various parts of France, a complete absence from France (1792–1798), a return to France in 1798, and his final departure from France in 1802.

While in France it was his habit to travel to the town of Spa, in Belgium to "take the waters"; and he was enjoying an extended stay at Spa when the reports of the two Royal Commissions were released. Mesmer lived for another 31 years after the Royal Commissions. He died at the age of 80, in Meersburg, in the Grand Duchy of Baden, on 5 March 1815.

Positioner of a concept

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Rather than being the "inventor" of "a technique", as some (mis)represent the circumstances, it is clear that Mesmer's significance was in his "positioning" of an overarching "concept" (or "construct") through his creation and development – using analogies with gravity, terrestrial magnetism, and hydraulics (as they were understood at the time) – of "an explanatory model to represent the way that healers had been healing people for thousands of years" (Yeates, 2018, p. 48).[51][52]

The (oft-forgotten) value and long-term significance of Mesmer's "positioning", according to Rosen (1959, pp. 7–8), is that "Mesmer's theory [in] itself . . . diverted attention from the phenomena produced by animal magnetism to the agent alleged to produce them"; yet, both 1784 Commissions side-stepped this issue, and "simply ascribed the magnetic cures to imagination, but never bothered to ask how imagination can produce a cure".[53]

Mesmer's "protoscience", rather than "pseudoscience"

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According to Tatar (1990, p. 49), rather than Mesmer's proposal being some sort of "occult theory", "[Mesmer] actually remained well within the bounds of eighteenth-century thought when he formulated his theories" and "the theories [that Mesmer] invoked to explain [the agency of "animal magnetism"] fit squarely into the frame of eighteenth-century cosmology": and, moreover, "to consider animal magnetism independently of the tradition out of which it emerged is to magnify its distinctively occult characteristics and to diminish in importance those features that mirror the scientific and philosophical temper of the age in which it flourished."

Rosen (1959, pp. 4–5) noted that, it was clear that

Mesmer's theory of animal magnetism . . . [within which] he employed the term magnetism to characterize a reciprocal relationship between the forces of nature and the human body, and [which] conceived of nature as the harmony of these relations in action . . . contains a number of themes and theoretical concepts common to the medical world of the eighteenth century . . . [which] is evident, for example, in his interpretation of disease as a disharmony attributable to a functional disturbance of the nervous fluid . . . [which is a] concept . . . derived from the ancient humoral pathology with its doctrines of dyscrasia and critical days, from the irritability theory of Albrecht von Haller (1708–1777),[54][55][56] and from the excitation theory of John Brown (1735–1788).[57]

In other words, as a product of its time,[58] Mesmer's enterprise was one of protoscience, rather than being one of pseudoscience – or, even, one of fringe science.

A concept that must not be reified

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It is clear from his Mémoire (1799) that Mesmer was very aware of the human propensity – in the normal, conventional use of language (la langue de convention) – to speak of "properties" or "qualities" (i.e., these "metaphysical abstractions", illusions de la méthaphysique), as if they were "substances": in Mesmer's words, "substantivise the properties", substantisia les propriétés (Mesmer 1799, pp. 15–17)[59] — in other words, "reification", in the manner of Whitehead's "fallacy of misplaced concreteness".[60]

Mesmer was also well aware of the extent to which, through the "distortion" caused by these "substantive words" (mot substantif) – which inappropriately "personified" (personnifia) these metaphysical abstractions (p. 16) – one is induced to believe in the actual physical existence of the "substance" itself. Given these observations, Mesmer was most emphatic in his continuous warnings that his abstract "principles" should not be "substantivised".

It is significant that Mesmer (1799) describes how, once he had formulated the abstract, overarching (metaphorical) construct/concept of "animal magnetism" as the therapeutic agent (a quarter of a century earlier) – and with his hope that this newly described "principle of action" (principe de action), when considered as an agent, "could become a means of healing and, even, one of preserving/defending oneself against disease" (p. 7, Mesmer's emphasis)[61] – the primary focus of his enterprise had become the threefold quest for the acquisition of an understanding of:

  • (a) how to rouse (and maintain) this agent, by every possible means – and acquire the knowledge of how, so-roused, it might be therapeutically harnessed in the most efficacious fashion (Mesmer, 1799, p. 48);
  • (b) (given that the agent's therapeutic effects were observed to be gradual, rather than instantaneous) the "obstacles" that typically divert, disturb, or impede the agent's capacity to attain the optimal treatment outcomes – and, once these "obstacles" had been identified, determine appropriate ways to "clear them away" ("de connoître et lever les obstacles qui peuvent troubler ou empêcher son action", p. 48); and
  • (c) the natural pathway along which the agent's therapeutic effects are realized, so that, in its application, these outcomes can be systematically anticipated – meaning that, with this knowledge, the (otherwise random) clinical applications can be controlled, regulated, and incrementally applied in a systematic way, until the target goal of a "cure" is attained (p. 49).

Based on natural principles

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Gassner, the exorcist, in action

Mesmer held the materialist position – that his therapies, which involved easily understood, systematic natural principles, were "physiological", rather than "psychological" interventions[62] – in contrast to the supernatural positions of, say, the exorcist Johann Joseph Gassner (1727–1779),[63]

By contrast with many "faith healers", [Gassner] had a quasi-scientific method of diagnosis, according to which he separated diseases that should be treated by a physician from those that he should treat. He first admonished the patient that faith in the name of Jesus was essential. He then obtained consent to use the method of "trial" exorcism. He entreated the Devil to defy Jesus by producing the patient's symptoms. If the convulsions or other symptoms appeared, Gassner believed they were the work of the Devil; he proceeded to exorcise the responsible demon. If symptoms failed to appear, he could not attribute them to a demon and sent the patient to a physician. – Ernest Hilgard, (1980).[64][65]

the mystic José Custódio de Faria, a.k.a. "Abbé Faria" (1756–1819), and the magnetists, such as d'Eslon, and, later, Charles Lafontaine (1803–1892),[66] whose demonstrations of "animal magnetism" were attended by James Braid in November 1841,

"Mesmer's approach to healing and his healing theory were physically oriented. His explanation of the phenomena of animal magnetism was consistently formulated in terms of matter and motion, and he believed that every aspect of animal magnetism could sooner or later be verified through physical experimentation and research." (Crabtree, 1993, p. 51)
"When Mesmer took a patient, his first concern was to determine whether the ailment was organic or functional. If it was organic, the result of physical damage to the tissue, he considered it, following [his] Proposition 23,[67] beyond the aid of animal magnetism. If it was functional, a physiological disorder affected by the nerves, it fell within the class of diseases he felt uniquely qualified to handle with his therapeutic technique." (Buranelli, 1975, pp. 107-108).

Charles d'Eslon

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Charles-Nicolas d’Eslon (1750–1786) [fr], "a disciple of the [eminent French] surgeon J.L. Petit",[68] was a docteur-régent of the Paris Faculty of Medicine, and the one-time personal physician to the King's brother, Charles Philippe, Comte d’Artois – who, later (following the Bourbon Restoration in France) became King Charles X.

Association with Mesmer

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d'Eslon's Observations (1780)

d’Eslon, a one-time patient, pupil, and associate of Mesmer,[69] published a work on Mesmer's version of animal magnetism (while still associated with Mesmer), Observations sur le Magnétisme Animal (1780),[70] which presented details of 18 cases (10 male, 8 female) treated by Mesmer.[71]

In stressing the efficacy of Mesmer's "animal magnetism" interventions, d'Eslon defended (at p. 124) the absence of clear explanations (from Mesmer) of the mechanism through which "animal magnetism" effects its "cures" with an observation that, although the purgative actions of rhubarb and Shir-Khesht manna (a.k.a. purgative manna) are well known to the medical profession, the mechanisms involved are not; and, so, in these cases, "facts" and "experience" are "our only guides" – and, in a similar fashion, asserts d'Eslon, "in relation to Animal Magnetism, it is the same, I don't know how it works, but I do know that it does work".

d'Eslon also directly addressed the charge that Mesmer had "discovered" nothing, and that the "extraordinary things" (des choses extraordinaires) that Mesmer had demonstrably effected were due to his "captivation of the imagination" (en séduisant l’imagination),[72] with the comment that,

"If [it were to be true that] Mesmer had no other secret than that he has been able to make the imagination exert an influence upon health, would he not still be a wonderful doctor? If treatment by the use of the imagination is the best treatment, why do we not make use of it?" (1780, pp. 46-47).[73]

Ostracism

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On 7 October 1780 – still associated with Mesmer and still a member of the Paris Faculty of Medicine – d'Eslon made an official request "that an investigation of the authenticity and efficacy of Mesmer's claims and cures be made. The Faculté rejected his plea, and in refusing accused [d'Eslon] personally of misdemeanour".[74]

d'Eslon's Lettre (1782)

On 15 May 1782, d'Eslon presented the Faculty with his arguments in the form of a 144-page pamphlet;[75] and then, "on 26 October 1782, [d'Eslon] was finally struck from the [Faculty's] roster and forbidden to attend any meeting for a period of two years" (Duveen & Klickstein, 1955, p. 286).[76]

Post-Mesmer

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In late 1782, and eighteen months before the Royal Commission, d'Eslon had (acrimoniously) parted ways with Mesmer; and, despite a brief reconciliation, the relationship was terminated in late 1783. On 28 December 1783, d'Eslon wrote a letter to the Journal de Paris, which not only described the difficulties he had experienced with Mesmer, but also announced that he was opening his own (entirely independent) clinic.[77]

Following his break with Mesmer, d’Eslon not only launched his own clinical operation – on his break with Mesmer, d'Eslon took all of the patients he had brought to Mesmer with him[78] – but also began teaching his own theories and practices (i.e., rather than those of Mesmer).[79] According to d'Eslon's own account (d'Eslon, 1784b, pp. 25–26), Mesmer had taught 300 students, 160 of whom were medical men (Médecins), and d'Eslon himself had taught 160 medical men (this group included 21 members of the Paris Faculty of Medicine).

Given that many of those who had privately paid Mesmer for the details of "the secret" were greatly dissatisfied, and had "[justifiably] accused [Mesmer] of having enunciated a theory which was merely a collection of obscure principles" (Binet & Féré, 1888, p. 13), it seems that d'Eslon's version was little better. Greatly confused by d'Eslon's version of "the secret", d'Eslon's student and associate, François Amédée Doppet, is said to have remarked that those to whom d'Eslon had revealed "the secret" doubted it even more than those to whom it had not been revealed.[80]

It was under these circumstances that a decision was made to investigate the work of d'Eslon – although he was already ostracized from the Paris Faculty of Medicine – when "d’Eslon, through influential friends, and tact, and other favourable circumstances, procured [the commissions'] establishment [specifically] to investigate animal magnetism as practised in his own clinic" (Gauld, 1992, p. 7, emphasis added).[81]

Last days

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Once d'Eslon had been expelled from the rank of docteur-régent, his membership of the Faculty of Medicine was never reinstated; and unlike Mesmer, he remained in Paris following the publication of the reports of the two Commissions. Although apparently in good health in the preceding months, he died somewhat suddenly in Paris, on 21 August 1786, at the age of 47,[82] from a complex of disorders including pneumonia, a malignant fever (une fièvre maligne), and renal colic.[83]

Aspects of Mesmer's evolving practices

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Mesmer's early experiments with magnets

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Maximillian Hell

It is significant that Mesmer, initially impressed by the therapeutic enterprises of the Jesuit astronomer, explorer, and healer Maximilian Hell (1720–1792) – which involved the application of steel magnets that had been specifically shaped either to fit particular body contours, or to match the actual dimensions of a specific organ (e.g., the liver)[84] – and, immediately recognizing the "prima facie plausibility"[85] of Hell's approach, purchased a number of steel magnets from Hell in 1774 and began applying them to his patients; however, as Pattie reports (1994, p. 2), Mesmer "had [entirely] abandoned the use of magnets" by 1776,[86] because his own clinical experimentation had proved them to be utterly useless.

By 1779, Mesmer (1779, pp. 34–35) was expressing his concern that many had "confused" – such as the "Berlin Academy" in 1775[87] – and were continuing to "confuse" the "properties" of his (abstract/theoretical) "Magnétisme animal" with those of an actual physical magnet (l'aimant): objects of which, he stressed, he had only ever spoken of as possible "conductors" of "animal magnetism".

Benjamin Franklin's glass Armonica (c.1776)

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