THE PRACTICAL VALVE OF BIRDS. 43 



Bryant, Harold C. The Numbers of Insects Destroyed by Western Meadow- 

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Chapman, Frank H. Handbook of Birds of Eastern North America. 



Color Key to North American Birds. 



National Audubon Society, Educational Leaflet: No. 38. The Bobolink. 

 The Economic Value of Birds to the State. N. Y. Forest, Fish and 

 Game Com., 1903. 



Cockerell, T. D. A. Notes on the Food of Birds. New Mex. Coll. Agric. and 

 Mech. Arts, Agric. Exper. Sta., Bull. No. 37, pp. 35-52, 1901. 



Cooke, W. W. The Relation of Birds to Horticulture. Ann. Kept. Colo. 

 State Board of Hortic. for 1898, pp. 45-53. 



Coues, Elliott. Birds of the Northwest. TJ. S. Geol. Surv. Terr. (Hayd^n 

 Survey), Miscell. Pub. No. 3, 1874. 



Birds of the Colorado Valley. U. S. Geol. Surv. Terr. (Hayden Survey), 



Miscell. Tub. No. 11, 1878. 



Key to North American Birds. 



Deane, Ruthven. The Passenger Pigeon Only One Bird Left. The Auk, Vol. 



XXVIH, P. 262, 1911. 

 Dearborn, Ned. How to Destroy English Sparrows. U. S. Dept. Agric., 



Farmers' Bull. No. 383, 1910. 

 The English Sparrow as a Pest. U. S. Dept. Agric., Farmers' Bull. 



No. 493, 1912. 



Drummond, James. Introduced Birds of New Zealand. The Condor, Vol. 

 XIV, p. 227, 1912. 



Dutcher, William. Results of Special Protection to Gulls and Terns Obtained 

 Through the Thayer Fund. The Auk, Vol. XVIII, pp. 76-103, 1901. 



Report of the A. O. U. Committee on the Protection of North American 



Birds. The Auk, Vol. XX, pp. 101-159, 1903. 



National Audubon Society Educational Leaflets : No. 2. The Mourning 



Dove. 3. The Meadowlark. 6. The Passenger or Wild Pigeon. 7. 

 The Snowy Heron. 8. The Marsh Hawk. 9. The Red-shouldered 

 Hawk. 10. The American Sparrow Hawk. 11. The Screech Owl. 12. 

 The Short-eared Owl. 13. The Ostrich. 14. The American Barn 

 Owl. 15. The Yellow-billed Cuckoo. 16. The Tree Sparrow. 17. The 

 American Goldfinch. 18. The Cardinal. 19. The Belted Kingfisher. 

 20. The R'ose-breasted Grosbeak. 21. The Scarlet Tanager. 22. The 

 Blue Jay. 23. The Killdeer. Special Leaflet No. 2. The Purple 

 Martin. Special Leaflet No. 10. The Wood Duck. 



Finlay, William L. National Audubon Society, Educational Leaflets : No. 40, 

 The Bush-tit. No. 45. The Black-headed Grosbeak. 



Fisher, A. K. Destruction of the [English] Sparrows by Poison. U. S. 

 Dept. Agric., Div. Econ. Orn. and Mam., Bull. No. 1, pp. 174-178, 1889. 



The Hawks and Owls of the United States in their Relation to Agricul- 

 ture. U. S. Dept. Agric., Div. Orn. and Main., Bull. No. 3, 1893, 210 

 pages. 



