88 ANIMAL ECOLOGY 



PETERS, A. W. 



1907. Chemical Studies on the Cell and its Medium. Part 



II, Some Chemico-Biological Relations in Liquid 



Culture Media. Amer. Jour. Physiol., Vol. XVIII, 



pp. 321-346. 



A study of changes in media and their biotic succession. 



COWLES, H. C. 



1911. The Causes of Vegetative Cycles. Bot. Gaz., Vol. 

 LI, pp. 161-183. Also Ann. Associa. Amer. Geogr., 

 Vol. I, pp. 1-20. 1912. 



An important statement of the general principles and 

 causes of vegetational changes. Includes a history 

 of the subject. 



1901. The Physiographic Ecology of Chicago and Vicinity; 

 A Study of the Origin, Development, and Classi- 

 fication of Plant Societies. Bot. Gaz., Vol. XXXI, 

 pp. 73-108, 145-182. 



A study of changes in the vegetation from the process 

 and genetic standpoint. 



CLEMENTS, F. E. 



1904. The Development and Structure of Vegetation. Bot. 



Surv. Nebraska, VII. pp. 175. Lincoln. 



Deals with vegetative changes from the process 



standpoint. 



1905. Research Methods in Ecology, pp. 334. Lincoln, 



Neb. 



CRAMPTON, C. B. 



1911. The Vegetation of Caithness Considered in Relation 



to the Geology, pp. 132. Comm. for the Survey 

 and Study of British Vegetation. 



1912. The Geological Relations of Stable and Migratory 



Plant Formations. Scottish Bot. Rev., Vol. I, pp. 

 1-61. 



Good examples of the process standpoint as applied 

 to the vegetation. 



