LIST OF ILLUSTRATIONS. xix 



FIG. PAGE 



66. Diagram of the Condition of the Arches of the Aorta towards the 



Close of Incubation . 216 



67. Diagram of the Arterial System of the Adult Fowl . . .219 



68. View from above of the Investing Mass and of the Trabeculse on 



the Fourth Day of Incubation . . . . . . .226 



69. View from below of the Paired Appendages of the Skull of a Fowl 



on the Fourth Day of Incubation .,*.',.. . . 229 



70. Side view of the Cartilaginous Cranium of a Fowl on the Seventh 



Day of Incubation * . * ,. . . . . . 231 



71. Embryonic Skull of a Fowl during the Second Week of Incubation 



(third stage) from below . . . . . . . .234 



