MAMMALIA 



288 



brown skin, and small ears. It manifests an intelligence 

 almost equal to the chimpanzee. The young are readily 

 trained to sit at a table, eat with a spoon, drink from a 

 cup, and give other performances. It lives in Borneo and 

 Sumatra. 



Structure of a Mammal. The structure of a mammal 

 may be understood by dissecting any one of the smaller 

 forms, such as the rat, guinea pig, rabbit, or cat. Although 



FIG. 320. Side view of the muscles of the cat's body. An irregular rectangular 

 piece has heen cut from each of the tAvo large side muscles and the two limbs 

 have been cut off near'the middle showing the bones white. From Davison's 

 " Mammalian Anatomy." 



the description here given applies specially to the cat, 

 yet any of the other species named may be used, as the 

 structure of all is practically the same. The animal can 

 be painlessly killed in twenty minutes by placing it in a 

 small, tight box or tin can containing a cloth or piece of 

 cotton wet with an ounce of chloroform or ether. 



The skin should be removed by making a slit in it along 

 the median ventral line and by pulling the cut edge outward 



