CLASSES OF ANIMALS 465 



12. What useful animals in your region depend for their existence 

 upon other animals ? How ? 



13. How can an animal be both useful and injurious ? 



14. What sources of animal food are worth cultivating on a larger 

 scale than heretofore ? 



15. What animals not cultivated are worth cultivating? 



16. What legal restrictions are there in your state upon the destruc- 

 tion of fish ? of birds ? of mammals ? of other animals ? 



17. What class of arthropods do you consider the highest ? Why ? 



18. What class of mollusks do you consider the highest ? Why ? 



19. What group of batrachians do you consider the highest ? of 

 reptiles ? 



REFERENCE READINGS 



Reese, A. M. Outlines of Economic Zoology, various chapters for 



special reports. 

 Waters, H. J. Essentials of the New Agriculture, chaps, xvi-xxiii. 

 United States Department of Agriculture. Bulletin 416, The Red Spider 



on Cotton. 

 Fanners' Bulletin 447, Bees. 



Bureau of Fisheries. Economic Circular 20, Caviar. 

 Bureau of Fisheries. Annual Report, 1919, Appendix 7, Freshwater 



Turtles a Source of Meat Supply. 

 United States Department of Agriculture. Circtdar 135, Maintenance of 



Fur Supply. 

 United States Department of Agriculture. Bulletin 1078, Beaver Habits 



and Possibilities of Beaver Farming. 

 United States Department of Agriculture. Bulletin 1049, Game as a 



National Resource. 

 Farmers' Bulletin 1055, Country Hides and Skins, Skinning, Curing, and 



Marketing. 

 Farmers' Bulletin 1247, Moles as Pests and as Fur-Bearers. 

 Farmers' Bulletin 896, Rats and Mice. 



Farmers' Bulletin 1397, Mouse Control in Field and Orchard. 

 Farmers' Bulletin 1302, How to get Rid of Rats. 

 Price List 21. Fishes. 

 Price List 39. Birds and Wild Animals. 



