Vol. IX] HALL & GRINNELL— LIFE-ZONE INDICATORS 67 



Grinnell, J., and Swarth, H. S. 



1913. An Account of the Birds and ]\Iamma]s of the San 

 Jacinto Area of Southern CaHfornia, with Remarks 

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Hall, H. M. 



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Merriam, C. Hart 



1898. Life Zones and Crop Zones of the United States. 

 U. S. Dept. Agric, Div. Biol. Surv., Bull. no. 10, 

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1899. Results of a Biological Survey of Moimt Shasta, 

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 in text. 



Schimper, A. F, W. 



1898. Pflanzen-geographie auf phvsiologischer Grund- 

 lage. Pp. 1-877, figs. 1-502, maps 1-4. 



Shreve, F. 



1914. The Role of Winter Temperatures in Determining 

 the Distribution of Plants. Amer. Journ. Bot., vol. 

 1, pp. 194-202. 



