ILLUSTRATIONS 



PLATES 



PLATE PAGE 



Gregor Mendel Frontispiece 



I. Rabbits ■ To face 60 



II. Sweet Peas "64 



III. Sheep "78 



IV. Sweet Peas "80 



V. Fowls « 107 



VI. Butterflies "146 



FIGURES IN TEXT 



FIG. 



1 . Scheme of Inheritance in simple Mendelian Case . . 21 



2. Feathers of Silky and Common Fowl .... 30 



3. Single and Double Primulas 31 



4. Fowls' Combs 32 



5. Diagram of Inheritance of Fowls' Combs . • • ■ 37 



6. Fowls' Combs 40 



7. Diagram of Fj Generation resulting from Cross between 



two White Sweet Peas 46 



8. Diagram illustrating 9:3:4 Ratio in Mice ... 52 



9. Sections of Primulas . . . . . . -55 



xi 



