LIST OF ILLUSTRATIONS. 



The Engravings are, with few exceptions, from Photographs, Drawings, and 

 Designs by Mr. Charles Berjeau and the Author. Such as are not original 



are duly acknowledged. 



PAGE 



Frontispiece. 



In the clutch of the enemy — (The Graphic), 



The three orders of lever — (Bishop), . . , . 19, 20 



The skeleton of a Deer — (Pander and D"* Alton), , . 21 



Muscular cycle in the act of flexing the arm, . , .25 



Screws formed by the bones of the wing of the bird, the bones of 

 the anterior extremity of the Elephant, and the cast of the 

 interior of the left ventricle of the heart, . . .28 



The muscular system of the Horse — (Bagg), . . .30 



The feet of the Deer, Ornithorhynchus, Otter, Frog, and Seal, . 34 

 The Red-throated Dragon, . . . . .35 



The Flying Lemur, ...... 35 



The Bat, ....... 36 



Chillingham Bull with extremities describing figure-of-8 move- 

 ments, . . . , . . .37 

 Double waved tracks described by Man in walking, . . 39 

 Horse in the act of trotting, . . . . .41 



Footprints of the Horse in the walk, trot, and gallop — (Gamgee), 43 

 Skeleton of the Ostrich — (Dallas), . . . .47 



Ostriches pursued by a hunter, , . . .48 



Skeleton of Man, ...... 55 



The positions assumed by the extremities and feet in walking 



— ( Weber) ....... 59 



Preparing to run — (Flaxman), . . . , .62 



The skeleton of a Perch — (Dallas), , . . .65 



The Salmon swimming leisurely, . . . .65 



Swimming of the fish according to Borelli, . . .67 



Swimming of the fish according to the Author, . . 63 



