1914] FULLER— EVAPORATION AND SOIL MOISTURE 233 



cession. The corresponding value of this ratio in the prairie 

 association is 62. 



8. The midsummer conditions of the prairie association seem 

 to be decidedly xerophytic. 



Grateful acknowledgment is made of the cooperation and 

 advice given by Professor Henry C. Cowles, under whose direc- 

 tion the investigation has been conducted, and of the assistance of 

 Messrs. Wade McNutt, E. M. Harvey, C. Shirk, and Miss L. 

 Newlon in collecting data. 



University of Chicago 



LITERATURE CITED 



1. Livingston, B. E., Evaporation and plant habitats. Plant World 1 1 : 1-10. 

 1908. Also see: Livingston, Grace J., An annotated bibliography of 

 evaporation. Monthly Weather Review 36-37: 1908-1909. 



2. Cowles, H. C, The ecological relations of the vegetation of the sand dunes 

 of Lake Michigan. Bot. Gaz. 17:117, 169-202, 281-308, 361-391. 1899. 



3. Transeau, E. N., A simple vaporimeter. Bot. Gaz. 49:459-460. 19 10. 



4. Nichols, G. E., A simple revolving table for standardizing porous cup 

 atmometers. Box. Gaz. 55:249-251. 1913. 



5. Livingston, B. E., Operation of the porous-cup atmometer. Plant 

 World 13:111-119. 1910. 



6. Brown, W. H., Evaporation and plant habitats in Jamaica. Plant 

 World 13:268-272. 1 9 10. 



7- Fuller, G, D., Germination and growth of the cottonwood upon the 

 sand dunes of Lake Michigan near Chicago. Trans. 111. Acad. Sci. 5:137- 



143. 1912. 

 8. Gleason, H. A., and Gates, F. C, A comparison of the rates of evapora- 

 tion in certain associations in central Illinois. Bot. Gaz. 53:478-491. 

 1912. 



9- Cowles, H. C, The physiographic ecology of Chicago and vicinity. Bot. 

 Gaz. 31:73-108, 145-182. 1901. 



10. McXutt, W., and Fuller, G. D., The range of evaporation and soil 

 moisture in the oak-hickory forest association of Illinois. Trans. 111. 

 Acad. Sci. 5:127-137. 1912. 



11. Fuller, G. D., Evaporation and the stratification of vegetation. Bot. 

 Gaz. 54:424-426. 191 2. 



12. Transeau, E. N., The relation of plant societies to evaporation. Bot. 

 Gaz. 45:217-231. 1908. 



13. Harvey, E. M., Evaporation and soil moisture on the prairies of Illinois. 

 Trans. 111. Acad. Sci. 6:92-99. 1913. 



