62 THE PRI^XIPLE^ OF MVODYNAMICS. 



45. The extent of the motions of the hand 



may be illustrated by the following measure- 

 ^ <_> 



ments of a case : 



(I.) From the long axis of the fore-arm the 

 hand was flexed 70 degrees. 



(2.) From the long axis of the fore-arm the 

 hand was abdiccted 10 deo^rees. 



(3.) From the long axis of the fore-arm the 

 hand was extended 7 5 degrees. 



(4.) From the long axis of the fore-arm the 

 hand was addueted 35 degrees. 



(5.) With external force the hand can be 

 moyed further in any direction than has just 

 been noted. 



46. In a certain case the dimensions of the 

 hand-leyer were as follows : 



(I.) The entire length was 4 inches — the dis- 

 tance from che heads of the metacarpal bones to 

 the base of the radius. 



(2.) The distance from the heads of the meta- 

 carpal bones to the point where the force in the 

 continuity of the leyer acts was 3 inches. 



(3.) The distance from the point where the 



