330 PLANT FRIENDS AND PLANT PESTS 



only one cent. Snakes, most of which are harmless, are 

 also garden friends. The black snake and milk snake 

 feed largely on rats and mice, while the common green 

 snake eats injurious insects, and the little brown De Kay 

 and garter snakes have a diet including slugs, which 

 sometimes do much damage in the garden. 



REFERENCE BOOKS 



Forbush, Useful Birds and Their Protection. Massachusetts Board of Agriculture. 



Hodge, Civic Biology, Chapters IV, XII, XIV. Ginn and Company. 



Hodge, Nature Study and Life, Chapter XVI. Ginn and Company. 



Hunter, A Civic Biology, Chapter XV. American Book Company. 



Hunter, Laboratory Problems in Civic Biology, Chapter II. American Book Com- 

 pany. 



Kellogg and Doane, Economic Zoology and Entomology, Part II, Chapters XXX, 

 XXXII, XXXIII, XXXIV, XXXV, XXXVI. Henry Holt and Company. 



Mayne and Hatch, High School Agriculture, Chapters V, VI. American Book 

 Company. 



Merriman, Birds of Village and Field. Houghton Mifflin Company. 



Moore and Halligan, Plant Productions, Part II, Chapter VII. American Book 

 Company. 



Sanford, The Story of Agriculture in the United States. Dl C. Heath and Company. 



Spillman, Farm Science, Chapters XII, XIII, XIV. World Book Company. 



Trafton, Science of Home and Community. The Macmillan Company. 



Webster, Value of Insect Parasitism to the American Farmer. U. S. Dept. of Agri- 

 culture Yearbook, 1907. 



Weed, Farm Friends and Farm Foes. D. C. Heath and Company. 



U. S. Dept. Agriculture, Farmers' Bulletins. (There are very many of these, each 

 treating a definite insect pest, or dealing with a definite fungus.) Ask to be 

 placed on the mailing list for the monthly list of bulletins. Then you may 

 select and send for those which interest you. 



