BIBLIOGRAPHY OF ECONOMIC RELATIONS OF BIRDS 14 7 
1878. 
Williston, S. W. The Prairie Dog, Owl, and Rattle- 
snake. American Naturalist, v. XII, p. 207. 
The shore lark part of food of the owl. 
1880. 
Brewer, T. M. The Value of Birds. Transactions 
Illinois State Horticultural Society 7 , 1870, v. XIII, 
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Reprint of an address delivered before theHingham (Mass.) 
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economic importance of birds. 
1880. Cummings, A. L. Horticultural Ornithology. Transac- 
tions Illinois State Horticultural Society 7 , 1879, v. 
XIII, pp. 295-298. 
Discussion of the economic relations of certain of our na- 
tive birds. 
1880. Forbes, S. A. The Food of Birds. Transactions 
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120-172. 
Discussion of the economic value of birds, followed by de- 
tailed account of the feeding habits of the robin, catbird, 
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tents of these birds. 
1880. Forbes, S. A. The Food of Birds. Bulletin Illi- 
nois State Laboratory Natural History, v. I, pp. 80- 
148. 
A general introduction discussing the necessity of a knowl- 
edge of bird food and methods of study, with extended rec- 
ords of studies of food of the thrushes and stone-chats. 
1880. Forbes, S. A. On Some Interactions of Organisms. 
Bulletin Illinois State Laboratory Natural History, 
v. I, pp. 3-17. 
A general discussion of the food relations of animals, with 
especial reference to birds and insects. 
1880. Forbes, S. A. Notes on Insectivorous Coleoptera. Bul- 
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v. 
