LIST OF ILLUSTRATIONS 



FIC" I'AGE 



1. DIAGRAM OF NORMAL X BRA CHYDACTYL - - - lO 



2. DIAGRAM OF BRACHYDACTYL X BRACK YDACTYL - - II 



3. DIAGRAM OF HETEROZYGOTE X HOMOZYGOTE - - 12 



4. ANTHER SHOWING SEGREGATION - - - I5 



5. DIAGRAM OF DOMINANT X RECESSIVE, F^ - - 18 



6. DIAGRAM SHOWING THE Fo IN THE ABOVE CROSS - 18 



7. DIAGRAM OF SEX CHROMOSOMES - - - I9 



8. DIAGRAM OF INHERITANCE OF SEX-LINKED CHARACTERS- 23 



9. PEDIGREE OF TORTOISESHELL-COLOURED EYES - - 49 



10. PEDIGREE OF BOLLENBACH FAMILY - - " 5^ 



11. PEDIGREE OF WHITE FORELOCK - - - 62 



12. PEDIGREE OF ALBINIS:\I - - - - 67 



13. BRACHYDACTYLOUS AND NORMAL HANDS - - 79 



14. RADIOGRAM OF A BRACHYDACTYLOUS HAND - - 80 



15. ABNORMAL SEGMENTATION OF FINGERS - - - 84 



16. RADIOGRAPH OF HANDS OF A GIRL IN THE SAME FAMILY 85 



17. SKIAGRAM OF HANDS OF A.T. - - - - 87 



18. PEDIGREE OF HEXADACTYLY - - - - IO4 



19. PEDIGREE OF HEXADACTYLOUS FAMILY - - IO5 



20. PEDIGREE OF COLOUR-BLINDNESS - - - 112 



21. PEDIGREE OF FEMALE SEX-LINKED BLINDNESS - - II 7 



22. PEDIGREE OF MALE SEX-LINKED BLINDNESS - - II7 



23. PEDIGREE OF MALE SEX-LINKED ICHTHYOSIS - - I18 



24. PEDIGREE OF FEMALE SEX-LINKED COLOUR-BLINDNESS- I18 



25. PEDIGREE OF CLEFT IRIS - - - - I20 



26. PEDIGREE OF EARLY DECAY OF TEETH - - 1 24 



27. PEDIGREE OF RIGHT BILOBED Ex\R _ - - 13^ 



28. PEDIGREE OF SMALL PIT IN LEFT EAR- - - I36 



29. PEDIGREE OF IMBECILITY IN FEMALE LINE - - 1 54 



30. IRISH SAILOR TWINS - - - - - 1 82 



31. THEIR FINGER PRINTS - - - - - 1 83 



32. TWINS FROM YORK, PENN. - - - - 1 84 



33. TWINS, MEN -__--_ 185 



34. TWINS, WOMEN, MICHIGAN - _ - - 186 



35. TWIN SISTERS, SWITZERLAND - - - - 1 86 



XUl 



