xii LIST OF ILLUSTRATIONS 



FIGURE FACING PAGE 



21. MENDELIAN INHERITANCE OF THE SHAPE OF THE SEED IN THE 



CULINARY PEA ... .... 68 



22. SINGLE COMB . 104 



23. ROSE COMB 104 



24. PEA COMB 106 



25. WALNFT COMB. . 106 



26. THE RESULT OF CROSSING MAPLE AND PURPLE-SPOTTED SEED 



COAT IN PISUM 110 



27. THE RESULT OF CROSSING GREY WITH WHITE SEED -COAT IN 



PISUM 114 



28. STARCH GRAINS OF BOUND PEA. . . . . . 128 



29. STARCH GRAINS OF WRINKLED PEA . . . . .128 



30. STARCH GRAINS OF A CROSS BETWEEN A BOUND AND A WRINKLED 



PEA 134 



31. STAGE IN THE DEVELOPMENT OF A FLOWER WHEN FERTILISA- 



TION OCCURS Page 148 



32. POLLEN GRAINS OF THE CULINARY PEA (MAGNIFIED ABOUT 50 



TIMES) ; POLLEN GRAINS OF THE CULINARY PEA (MAGNIFIED 

 ABOUT 160 TIMES) ....... 152 



33. TO ILLUSTRATE METHOD OF LABELLING MALE AND FEMALE 



PARENTS OF CROSS . . . . . . .154 



34. JOHN GOSS'S GARDEN ; WHERE HE MADE HIS CROSSES IN 1820 194 



