ANIMAL MECHANICS. 417 



Muscular Type of Struthionidce — Hip Joint. 





Abductors. 



Flexors. 



Extensors. 



Adductors. 



1. Ostrich, . 



2. Emu, .... 



3. Ehea, .... 



4. Cassowary, . . 



Per cent. 

 41. 17 

 43.26 

 44-73 

 45.76 



Per cent. 



13.39 

 12. 06 

 10. 29 

 15-9° 



Per cent. 

 31.48 

 29. 60 

 30 85 

 25. 10 



Per cent. 

 13.96 

 T5.08 



I4.I3 

 13.24 



If we compare this Table with the preceding Tables, we 

 shall see that the peculiarities of the Struthionidae consist in 

 the development of the abductor muscles (which give the 

 power of standing erect) and of the extensor muscles (which 

 measure the power of running). This will be better seen by 

 the following comparison of the most important individual 

 muscles, on which these actions mainly depend :— 



Comparative View of the Standing and Running Powers of the 

 Struthionidod and other Animals. 





Ostrich. 



Emu. 



Ehea. 



Casso- 

 wary. 



Man. 



" Mas- 

 ter Ma- 

 grath." 



Standing. 



Per 



cent. 



Per 

 cent. 



Per 

 cent. 



Per 



cent. 



Per 

 cent. 



Per 

 cent. 



[Agitator caudse, . . \ 

 1 . | Tensor vaginae femoris, 

 ( Glutasus primus, . . ) 



24.04 



25.86 



25.37 



26.57 



20.61 



7.01 



Running. 















2. Biceps femoris, . . . 



21.62 



18.57 



17.04 



15.40 



5.50 



21 . 23 



In this Table, the contrast between Man and the Dog is 

 well brought out; and it is shown that the Struthionidse 

 excel in both the respective peculiarities of Man and the Dog; 

 2 E 



