x ILLUSTRATIONS 



FIGURE PAGE 



53. Part of a Human Muscle Fibre .... 147 



54. Sections from an Orbital Gland of a Dog . . . 148 



55. Diagram of Three Cells of a Salivary Gland . . 148 



56. Embryonic Syncytium ...... 150 



57. Amoeba Proteus ....... 153 



58. Sections of Three Ova in very Early Stages . . 162 



59. Progressive Segmentation of the Ovum . . . 164 



60. The Segmentation of the Ovum of Planorbis . .173 



61. Nuclei from Rabbit Embryos . . . . .176 



62. Section across the Posterior Part of an Embryo 



Dog-fish ........ 182 



63. Section of the Cerebellum of a Child of Thirteen Days 187 



64A. Section of a Lens of the Eye of a Chick of Sixty-eight 



Hours' Incubation ...... 190 



646. Section of a Lens of the Eye of a Chick of Ninety-six 



Hours' Incubation ...... 190 



65. Section of a Gland of the Large Intestine of an Adult 



Cat .193 



66. Vignette from Trembley's Classic Memoir .' . 198 



67. Stentor . . . . . . . . .199 



68. Striated Muscle Fibres in Process of Regeneration . 202 



69. Section of the Epithelial Lining of the Human 



QEsophagus . . . . ... 203 



70. Longitudinal Sections through the Antenna of Oniscus 208 



71. Section through a Regenerating Antenna of Oniscus . 209 



72. Portion of the Outer Wall of a Primitive Muscular 



Segment of a Cat Embryo ..... 220 



73. Age-Reckoner ....... 272 



