REFERENCES 219 



Clements, F. E., Weaver, J. E., and Hanson, H. C: Plant Competition, 



Carnegie Inst., Wasliington, Publ. 398, 1929. 

 Cooper, W. S.: The Climax Forest of Isle Royale, Lake Michigan, and Its 



Development, Bot. Gaz., 55, 1-44, 115-140, 189-235, 1913. 



— ■ The Fundamentals of Vegetational Change, Ecology, 7, 391-412, 1926. 



CoTTAM, W. P., and Stewart, George: Plant Succession as a Result of 



Grazing and of Meadow Desiccation by Erosion Since Settlement in 1862, 



Jour. Forestry, 38, 613-626, 1940. 

 CowLEs, H. C: The Causes of Vegetative Cycles, Bot. Gaz., 51, 161-183, 1911. 

 Daubenmire, Rexford F.: Plant Succession Due to Overgrazing in the 



Agropyron Bunch-grass Prairie of Southwestern Washington, Ecology, 21, 



55-64, 1940. 

 Gleason, H. a. : Further Views on the Succession Concept, Ecology, 8, 299- 



326, 1927. 

 Haig, I. T.: Factors Controlling Initial Establishment of Western White 



Pine and Associated Species, Yale Univ., School For., Bull. 41, 1936. 

 Hamly, D. H. : Softening of the Seeds of Melilotus alba, Bot. Gaz., 93, 345-375, 



1932. 

 HuTCHiNGs, S. S.: Light in Relation to the Seed Germination of Mimvlns 



ringens L., Am. Jour. Bot., 19, 632-643, 1932. 

 Larson, Floyd: The Role of Bison in Maintaining the Short Grass Plains, 



Ecology, 21, 113-121, 1940. 

 MooERs, C. A.: The Effect of Spacing on the Yield of Cotton, Jour. Am. Soc. 



Agron., 20, 211-230, 1928. 

 NiCHOL, G. E.: The Influence of Exposure to Winter Temperatures Upon 



Seed Germination in Various Native American Plants, Ecology, 15, 364-373, 



1934. 

 Stoa, T. E.: Persistence of Viability of Sweet Clover Seed in a Cultivated 



Soil, Jour. Am. Soc. Agron., 25, 177-181, 1933. 

 Stuart, W., and Milstead, E. H.: Shortening the Rest Period of the Potato, 



U. S. Dep. Agriculture, Tech. Bull. 415, 1934. 

 Whitford, H. N.: The Genetic Development of the Forests of Northern 



Michigan, Bot. Gaz., 31, 289-325, 1901. 



