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 



37. 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 



4oa. PURE LINES IN PARAMCECIUM (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 



