254 



FIRST LESSONS IN ZOOLOGY 



and draut^lit; swine, sheep, cattle, and goats furnish flesh, 

 and the two hitter milk, for food; the a\oo1 of sheep, the 

 furs of the carnivores, and the leather of cattle, horses, 

 and others are used for clothing, while the bones and 

 horns of various mammals serve many useful purposes. 



Flij. 205. — Lliiimiuiik. ( l^■rnub^iuIl of Camera Craft.) 



The house-mouse ; an example. — .Specimens of tlie 

 house-mouse should be obtained b)' trapping, and its ex- 

 ternal structure compared with that of the frog and sparrow. 

 The mouse, unlike the other vertebrates so far studied, is 

 thickly co\-ered with hair all over its bod\' except on the tip 



