424

" D. THE ESSENCE OF MENDELISM 429

" E. USEFUL WORKS OF REFERENCE 436

" F. GLOSSARY 437

LIST OF ILLUSTRATIONS

FIGURE PAGE

1. Four Baby Girls at Once 6

2. The Effect of Nurture in Changing Nature 10

3. Height in Corn and Men 12

4. Why Men Grow Short or Tall 14

5. Bound Foot of a Chinese Woman 42

6. Defective Little Toe of a Prehistoric Egyptian 42

7. Effect of Lead as a "Racial Poison" 63

8. Distribution of 10-Year-Old School Children 76

9. Variation in Ability 77

10. Origin of a Normal Probability Curve 78

11. The "Chance" or "Probability" Form of Distribution 79

12. Probability Curve with Increased Number of Steps 80

13. Normal Variability Curve Following Law of Chance 80

14. Cadets Arranged to Show Normal Curve of Variability 82

15. Variation in Heights of Recruits to the American Army 82

16. How Do You Clasp Your Hands? 100

17. The Effect of Orthodactyly 102

18. A Family with Orthodactyly 102

19. White Blaze in the Hair 104

20. A Family of Spotted Negroes 104

21. A Human Finger-Tip 106

22. The Limits of Hereditary Control 106

23. The Distribution of Intelligence 106

24. The Twins whose Finger-Prints are Shown in Fig. 25 108

25. Finger-Prints of Twins 110

26. A Home of the "Hickory" Family 168

27. A Chieftain of the Hickory Clan 170

28. Two Juke Homes of the Present Day 172

29. Mongolian Deficiency 174