ON AERIAL LOCOMOTION. 323 



require that enormous amonut of force usually supposed, aud that iu 

 fact birds do uot exert more power in tlyiug- thau quadru[)eds in run- 

 ning, but considerably less; for the wing movements of a large bird, 

 travelling at a far higher speed in the air, are very much slower; and 

 where weight is concerned, great velocity of action in the locomotive 

 organs is associated with great force. 



It is to be hoped that further experiments will confirm the correct- 

 ness of these observations, and with a sound working theory upon 

 which to base his operations man may yet command the air with the 

 same facility that birds now do. 



