CONTENTS. 



ANIMAL LOCOMOTIOK 



INTRODUCTIOi^'. 



PAGE 



Motion associated with the life and well-being of animals, . 1 

 Motion not confined to the animal kingdom ; all matter in 

 motion ; natural and artificial motion ; the locomotive, 

 steamboat, etc. A flying machine possible, . . 2 



Weight necessary to flight, ..... 3 



The same laws regulate natural and artificial progression, . 4 

 Walking, swimming, and flying correlated, ' . . .5 



Flight the poetry of motion, . . . . .6 



Flight a more unstable movement than that of walking and 

 swimming ; the travelling surfaces and movements of ani- 

 mals adapted to the earth, the water, and the air, . 7 

 The earth, the water, and the air furnish the fulcra for the levers 



formed by the travelling surfaces of animals, . . 8 



Weight plays an important part in walking, swimming, and 



flying, ....... 9 



The extremities of animals in walking act as pendulums, and 



describe figure-of-8 curves, .... 9 



In swimming, the body of the fish is thrown into figure-of-8 



curves, ....... 10 



The tail of the fish made to vibrate pendulum fashion, . 1 1 



The tail of the fish, the wing of the bird, and the extremity of 

 the biped and quadruped are screws structurally and 

 functionally. They describe figure-of-8 and waved tracks, 12 



