438 Wisconsin Academy of Sciences , Arts, and Letters. 
degree deposited by Mr. Sherwood in library, University of Wis¬ 
consin, June, 1920. 
11. The relation of soil temperature to the development of onion 
smut, TJ'rocystis cepulae. J. C. Walker with the writer. In prog¬ 
ress 1918-1920. The influence of soil moisture is also being investi¬ 
gated. (To be published in the Journal of Agricultural Research.) 
12. The relation of soil temperature, soil moisture, and other en¬ 
vironmental factors to infection and development of certain grain 
smuts. Mrs. E. T. Bartholomew and Edith K. Seymour. In 
progress under the support of the U. S. Department of Agricul¬ 
ture, Bureau of Plant Industry. 1917 to date. 
13. The relation of soil temperature and other environmental 
conditions to infection with certain Fusarium diseases of the cereals. 
J. G. Dickson and Helen Johann. In progress 1918 to date, the 
major part of the support coming from the U. S. Department of 
Agriculture, Bureau of Plant Industry. 
14. The relation of soil temperature and other factors to the de¬ 
velopment of the scab of potatoes caused by Actinomyces scabies. 
H. H. McKinney in association with the writer. In progress 1918 
to date. See preliminary notes, Phytopath. 9: 301-302, 1919, and 
10:63. 1920. 
15. The relation of soil temperature and other factors to the 
Fusarium wilt of tobacco. James Johnson. In progress 1918 to 
date. 
16. The relation of soil temperature to the root and stem rot of 
peas caused by species of Pythium and Fusarium (previously 
noted). F. R. Jones. In progress 1918 to date. 
The above list is intended to show at a glance the varied angles 
of approach to what is basically one type of problem and also the 
personnel of the cooperating investigators. It will also make it 
clear that in the limits of such a paper as this it must suffice 
merely to outline the research methods proved most useful and to 
attempt a correlated summary of the results obtained in a few 
typical cases. 
