xvi LIST OF ILLUSTRATIONS 



FIG. PAGE 



29. Diagram illustrating Galton's law of ancestral inherit- 



ance (after Galton and Meston) ..... 325 



30. Diagram to illustrate the difference between statis- 



tical and physiological formulation (after Darbishire) 334 



31. Peas showing Mendel's law ..... facing 339 

 2,2. Diagram of Mendel's law ..... ,, 340 

 T,},. Diagram of Mendelian inheritance in Mirabilis jalapa 



facing 343 



34. Diagram illustrating Mendel's law . . ,, 347 



35. Diagram illustrating segregation of germ-cf-lls . . . 344 



36. Combs of Fowls ....... facing 353 



T)7. Hybridisation in Mirabilis jalapa (from Correns) ,, 357 



38. Mendelian phenomena in nettles (from Correns) . . . 359 



39. Mendelian phenomena in wheat (after R. H. Biffen) facing 360 



40. Mendelian phenomena in Helix hortensis (after Lang) 



facing 362 



41. Varieties of wheat (after R. H. Biffen) .... 390 



42. Modes of segmentation ...... facing 422 



43. Relation between reproductive CELLS and the "body" . 434 



44. Diagram of maturation and fertilisation .... 440 



45. Sexual dimorphism in humming-birds (from Darwin, after 



Brehm) .......... 482 



46. Sexual dimorphism in grasshoppers (from Darwin) . . 484 



47. Diagram of protoplasmic changes ...... 500 



48. Diagram illustrating determination of sex (after 



Newcomb) .......... 502 



49. Diagram illustrating the relation between reproduction 



AND individuation ........ 535 



