THE HIND EXTREMITIES. 87 



The bone is made up of two symmetrical halves,* 

 each half being made up of three distinct bones 

 which become inseparabl}^ united in adult life at 

 their lower middle portion. These are called 

 'ilium' 'ischium' 'pubis.' We find the 'ilium' 

 making up b}^ far the largest part of the bone, and 

 is all the part in front of the joint, and on which 

 we have placed the "f shaped figure. It also helps 

 to form a part of the cavity of the joint. The 

 'ischium' is all the part behind the joint from 4 

 to 3. It also helps to form the joint. The ' pubis' 

 is not well seen in our figure but is a small flat part 

 which with its fellow unites the two halves of the 

 bones together. It concerns us here so little that 

 we shall not further notice it. 



lb. — The ' ilium' is irregularly T shaped. 

 The two ends of the top of the T are rough and 

 prominent, the external end at 1 more especially so, 

 and is that ' point' in Mark Twain's horse which he 

 hired in the Sandwich Islands, situated behind the 

 saddle on which he hung his hat. The other end 

 of the T at 2 is also rough, but not nearly so pro- 

 minent, yet it too is conspicuous in some horses. 

 This top of the T i« ^I'^t and very broad and con- 

 cave from one end of the top of the T to the other. 

 As it approaches tlie joint it becomes narrow and 

 nearly round like a long bone, and like a long bone 

 widens out to help to form the joint. 



7G.— The 'ischium' part of bone (between 4 

 and 3) is seen to be quite like a long bone in its 



* Our description applies to eitlier half. 



