LIST OF ILLUSTRATIONS. 



xvil 



FIGURE 



73. Gallus domesticus : The left half of the skeleton, 



right side .... 



74. The skull from the right side 



75. Columba livia : Dissection from the right side 



76. Development of the chick : The egg 



77-78. 



79-81. 



82. 



83. 



84. 



85. 



86-87. 



90. 

 91. 

 92. 



PAGE 



from the 



. 402 



. 410 



. 440 



. 467 



. 469 

 469-71 



94. 



Segmentation of germinal disc 



Sections of segmenting blastoderm 



Blastoderm at 20th hour . 472 



Section of blastoderm at 20th hour . . 472 



Section of one-day chick embryo . . . 473 



Blastoderm at 24th hour .... 475 



Surface view and section of chick embryo of 



36 hours 476 



Section of embryo (43 hours) . . . 477 



Section of embryo (24 hours) . . . 478 



Section of embryo (48 hours) . . . 479 



Section across head of two-day chick . . 483 



Section across head of 60 hours . . . 484 



Blastoderm at 36 hours .... 486 



Three-day chick . . . . 487 



