The Friunework of the Bird 



99 



In the chicken, we next come to a single lonp; hone 

 called the tarsus, which is, in life, covered with scales. 



t^G. 73. — Skeleton of an Ostricti 



leg aiKi foot. 



Human leg and foot. 



In the embr^'O it is composed of several separate l)ones.* 

 The simplest interpretation we can give to the foot of 



* These correspond in ourselves to the bones of the upper foot and tlie 

 second row of carpals, this joint of the leg coming, therefore, really bet \ve(Mi 

 the bones of the ankle, instead of, as in ourselves, between the ankle and the 

 lower part of the leg. 



