KV1 



LIST OF WOODCUTS. 



49. Gastrula of Chick . . 228 



50, 51. Four secondary germ- 



layers .... 236 

 52-56. Diagrammatic longitu- 

 dinal and transverse sec- 

 tions through the ideal 

 Primitive Vertebrate . 256 

 57,58. „ n 259 



59. „ „ 263 



•60. „ „ 264 



61. » » 267 



62-69. Diagrammatic trans- 

 verse sections through 

 the most important germ- 

 forms of the ideal Primi- 

 tive Vertebrate . . 276 



70. Diagrammatic transverse 



sections through various 

 mammalian germs (ex- 

 plaining the separation 

 of the intestine from the 

 yelk-sac). . . .283 



71. Gastrula of Mammal . . 288 



72. Intestinal germ-vesicle of 



Mammal . . .289 



73. Transverse section through 



the intestinal germ- 

 vesicle of Mammal . 289 



74. Exoderm-cells of the above 290 



75. Entoderm-cells of the above 290 



76. Transverse section through 



germ-area . . . 293 

 77-81. Intestinal germ-vesicle 



of Babbit . . .294 

 82, 83. Germ-area of ftabbit . 296 

 84. „ „ 297 



«5. « » 298 



86. Sole-shaped gepm-shield 



of Dog . . . . 298 



87. Sole-shaped germ-shield 



of Chick . . .298 



88. Transverse section 



through germ-shield . 300 



89. „ „ 301 



90. ., „ 302 



91. „ „ 304 



92. „ „ 306 



93. „ „ 309 



94. Development of egg-mem- 



branes . . . . 312 



95. Transverse section 



through germ of Chick . 317 

 96,97. „ „ 318 



98. „ „ • 319 



99. „ „ 331 



100. Separation of the intes- 



tine from the yelk- sac 

 (diagrammatic) . . 333 



101. Longitudinal section 



through embryo Chick . 336 



102. Longitudinal section 



through head of an 

 embryo Chick . . 337 



103-105. Lyre-shaped Chick 



embryo . . . 342 



106, 107. Germ-disc or germ- 

 area of Eabbit . . 344 



108,109. „ „ 345 



110, 111. Skeleton of Man . 351 



112. Transverse section 



through germ of Chick . 352 



113. Human neck-vertebra . 354 



114. Human chest-vertebra . 354 



115. Human lumbar. vertebra . 364 



