LIST OF ILLUSTRATIONS. vii 



FIG. 



71. Section of Man's Brain 



72. Part of same enlarged . . . 



73. Diagram of Brain's Growth 



74. Brain of Frog {after Wyman) 



75. Muscles of Man's Eyeballs {from Huxley's "Elementary 



Physiology") ......•• 



76. Man's Heart {from Huxley's " Elementary Physiology") 



77. Frog's Heart {after Briicke) . . . 



78. Section of Ditto 



79. Diagram of Ditto . . . ■ • • • 



80. Gills of Fish 



81. Head of Lepidosiren 



82. 83, and 84. Circulation in Tadpole .... 



85. Diagrams of Primitive Aortic Arches .... 



86. Diagram of Aortic Arches of a Lizard 



87. Diagram of Aortic Arches of a Bird .... 



88. Diagram of Aortic Arches of a Mammal 



PACK 



118 



119 

 121 



123 

 129 



137 

 138 



139 

 140 

 140 

 140 

 140 



