LIST OF ILLUSTRATIONS. 



FG. FAGK 



71. Section of Man's Brain . 115 



72. Part of sanae enlarged . . . . . . .118 



73. Diagram of Brain's Growth . . . . . . .119 



74. Brain of Frog [after Wyman; . . . . . .121 



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



Physiology") 123 



76. Man's Heart {from Huxley's "Elementary Physiology") . 129 



77. Frog's Heart {after Brlicke) . . . . -133 



78. Section of Ditto 134 



79. Diagram of Ditto . . . . . . . -135 



So. Gills of Fish 137 



81. Head of Lepidosiren ........ 138 



82, 83, and 84. Circulation in Tadpole ... 139 



85. Diagrams of Primitive Aortic Arches . ... 140 



86. Diagram of Aortic Arches of a Lizard . . . .140 



87. Diagram of Aortic Arches of a Bird ... . 140 

 ■j^S. Diagram of Aortic Arches of a Mammal . . . 140 



