LITERATURE EXAMINED. 



Bailey, Vernon. 



1912. Directions for field work of the assistants of the Biological Survey : 

 Form 69, Bur. Biol. Surv., pp. 1-10, U. S. Dept. Agr., May 27, 1912. 

 Chapman, Frank M. 



1900. Bird studies with a camera. Pp. xiv+218, 110 illustrations. 

 Coles, Elliott. 



1S7T. [Note on information desired regarding North American mammals, 

 in column of " Scientific News."] Amer. Nat., 11, pp. 505-50G, 

 Aug., 1877. 

 Nelson, Edward W. 



1918. Wild Animals of North America. Nat. Geogr. Soc, pp. 3S5-612, 



numerous illustrations in text, title page, 2 unnumbered pages, 

 frontispiece. 

 Osborn, Herbert. 



1919. Zoological aims and opportunities: Science, N. S., 49, pp. 101-112, 



Jan. 31, 1919. 

 Ritter, William E. 



1917. "Back to nature" scientifically as well as emotionally; the case for 

 more field work in biology: Amer. Mus. Journ., 17, pp. 403-40G, 

 Oct., 1917. 

 Roosevelt, Theodore. 



1917. Productive scientific scholarship: Science, N. S., 45, pp. 7-12, Jan. 5, 

 1917. 

 Seton, Ernest Thompson. 



1909. Life-histories of northern animals. 2 vols., continuously paged, 

 pp. xxx+1267, maps 68, pis. 100, 267 figs, in text. 

 Strong, R. M. 



1914. On the habits and behavior of the herring gull, Larus argentatus 



Pont.: Auk, 31, pp. 22-49, pis. 3-10, 1 fig. in text, Jan., 1914. 

 Taverner, P. A. 



1915. Suggestions for ornithological work in Canada: Ottawa Nat., 29, 



pp. 14-18, 21-2S, 1915. 

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