148 THE ECONOMIC IMPORTANCE OF ANIMALS 



Problem 120: How animals may benefit mankind. 

 Materials. — Hunter's Civic Biologij, pages 197-231, Toothaker's 

 Commercial Raw Materials, Government and State Department re- 

 ports of various kinds. 

 A visit to a commercial 

 museum. 



Method. — Using 

 your sources of in- 

 formation, make out 

 in tabular form a report giving (1) habitat, (2) use, (3) prep- 

 aration of product, (4) other interesting facts with reference 

 to the following animals: cow, sheep, horse, pig, whale, 

 walrus, honeybee, 

 ichneumon fly, silk- 

 worm, lady bug, tach- 

 ina fly, gall insects, 

 blister beetles, lac in- 

 sect, cochineal, bum- 

 blebee, carrion beetle, 

 toad, house wren, 

 cuckoo, bank swallow, 

 bluebird, woodpecker, 

 brown thrush, gull, 

 vulture, owl, black 

 snake, milk snake, 

 green snake. 



Conclusion. — In 

 what ways are the 

 above animals useful 

 to man ? 



Problem 121: To 



find out how birds 

 are of economic im- 

 portance. 



Materials. — Pam- 

 phlets of the Depart- 



