Includes bibliographical references (p. [319]-322) and index
11. Chance Encounter -- III. Balancing. 12. Cutouts. 13. Seesaw, Marjorie Daw. 14. Two Pearls -- IV. Numbering. 15. New Numbers for Old. 16. Prime News. 17. The Unknown Division. 18. Secret Messages -- V. Winning
19. Be Wise, Optimize. 20. The Play's the Thing
I. Recalling. 1. Reflections. 2. Hand in Hand. 3. Further Progression -- II. Counting. 4. Interesting Numbers. 5. Tenpins, and Counting. 6. Order and Reorder. 7. Outcast. 8. The Power of Two. 9. Divide and Conquer. 10. Set and