92 UTILITY OF THE MAMMALIA TO MAN. 



sheep, and the whale and the seal furnish oil for 

 burning in lamps. The bristles of the hog are 

 made into brushes. The horns and teeth, (espe- 

 cially elephants' teeth, or ivory,) and the bones 

 of mammalia, are worked up by the turner into 

 a variety of useful and ornamental articles 5 as 

 knife-handles, boxes, and combs ; and glue is 

 made by boiling down their bones, horns, and 

 sinews. 



Questions. 



What class of animals is particularly useful to man? 



Mention some of the mammalia, and the uses they are of ? 



What animals supply us principally with food ? 



For what purpose are skins, hair, and wool used ? 



What are hats made of? 



What is made from the hair of cows, calves, and horses ? 



From the wool of what animal are made flannels, baize, 

 and serge ? 



What is leather, and what name is given to the process of 

 making it ? 



Are the horns, teeth, and bones of mammalia useful ? 



What is glue? 



