THE HUMAN HAND ; A SCHOOL LESSON 39 



wards). Tree-climbing quadrupeds can usually rotate the 

 hand freely. Carnivorous quadrupeds, which strike their 

 prey with the fore paws, have a limited power of rotation. 

 Quadrupeds which use the fore limb solely for running 

 have it fixed in the prone position, and the ulna is usually 

 much reduced in size. 



It is not difficult to procure the fore-feet of certain 



FIG. io. Bones 

 of the hand of a 

 Pig. 



FIG. ii. Bones 

 of the hand of an 

 Ox. There is a pair 

 of stunted digits 

 behind. 



FIG. 12. Bones 

 of the hand of a 

 Horse. 



common animals, and to prepare skeletons of them. The 

 dog, pig and sheep make an instructive series, which 

 becomes much more interesting if the horse and bat can 

 be added. From the actual skeletons of the fore-feet 

 rough models are easily made with bits of tobacco-pipe 

 and wires. 



Dog. There are five fingers, all bearing claws. All the 

 metacarpals are separate. The first finger (thumb) is 



