XVlll 



LIST OF FIGURES 



FIG. 



2,2i- Mitosis in Erysiphe ....... 



34. Mitosis in pollen-mother-cells of lily, according to Guignard 



36. Mitosis in spore-cells of Eqiiisetiim 



37. Heterotypical mitosis 



38. Mitosis in Infusoria 



39. Mitosis in Etiglypha 



40. Mitosis in Euglena 



41. Mitosis in Acanthocystis 



42. Mitosis in Noctiliica 



43. Mitosis in Paramaba 



44. Mitosis in Actinospharium 



45. Mitosis in Actinosphivriiim . 



46. Pathological mitoses in cancer-cells 



47. Pathological mitosis caused by poisons 



48. \'an Beneden's account of astral systems in Ascaris 



49. Leucocytes ..... 



50. Pigment-cells .... 



51. Heidenhain's model of mitosis 



52. Mitosis in the egg of Toxopneusies 



53. Pathological mitoses in polyspermy 



54. Nuclei in the spireme-stage . 



55. Early division of chromatin in Ascaris 



56. Amitotic division .... 



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"3 



"5 



CHAPTER III 



57. Volvox 



58. Ovum of Toxopneustss . 



59. Ovum of the cat .... 



60. Ovum of Nereis .... 



61. Germinal vesicles of Unio and Epeira 



62. Insect-egg ..... 



63. Micropyle in Argonauta 



64. Germ-cells of Volvox 



65. Diagram of the flagellate spermatozoon 



66. Spermatozoa of fishes and amphibia 



67. Spermatozoa of birds and other animals 



68. Spermatozoa of mammals 



69. Unusual forms of spermatozoa 



70. Spermatozoids of Chara 



71. Spermatozoids of various plants 



72. Germ-cells of Cladonema 



73. Primordial germ-cells of Ascaris . 



74. Primordial germ-cells of Cyclops . 



75. Ovarian ova and follicles of Helix 



76. Egg and nurse-cells in Ophryotrocha 



77. Ovarian eggs of insects . 



78. Young ovarian eggs of various animals 



79. Young ovarian eggs of birds and mammals 



80. Ovarian eggs of spider, earthworm, ascidian, showing yolk-nucleus 



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