NATURAL HISTORY NINETEENTH CENTURY. 637 



the foot with the hand, ot the ankle with the wrist, of the knee with 

 the elbow, are too obvious to be overlooked. But very little know- 

 ledge of anatomy suffices to show that the resemblance is much deeper : 

 that a single bone (the femur] articulates with the hip, and a single 

 bone with the shoulder; two bones (the tibia and \hzfibnld) form the 

 leg below the knee ; two (the radius and the ulna) enter into the 

 structure of the fore-arm. The foot and the hand are each supported 

 on a series of small bones, and consist of five similar pieces (the 



