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) 330 



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



32. Diagram of Mendel's law . . . . . 340 



33. Diagram of Mendelian inheritance in Mirabilis jalapa 



facing 343 



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



35. Diagram illustrating segregation of germ-cells . . 344 



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



17. Hybridisation in Mirabilis jalapa (from Correns) . ,, 355 



38. Mendelian phenomena in nettles (from Correns) . 357 



39. Mendelian phenomena in wheat (after R. H. Biffen) facing 358 



40. Mendelian phenomena in Helix hortensis (after Lang) 



facing 360 



40a. Pure lines in Paramecium (from Jennings) . . . 378 



41. Varieties of wheat (after R. H. Biffen) . . . 384 



42. Modes of segmentation .... facing 438 



43. Relation between reproductive cells and the " body " . 430 



44. Diagram of maturation and fertilisation . . . 436 



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



Brehm) ......... 479 



46. Sexual dimorphism in grasshoppers (from Darwin) . .481 



47. Diagram illustrating the relation between reproduction 



and individuation . . ..... 539 



