14 BULLETIN 149, U. S. DEPARTMENT OF AGRICULTURE, 
from any experiments yet described that such elements can have any 
practical application as a fertilizer in general farming. 
Evidence is given to show that the action of uranium on plants is 
due to its chemical properties rather than to its property of being 
radioactive, and that the confiicting results obtained with radio- 
active manure from different sources is to be explained largely by 
the presence of uranium, and of such nonradioactive constituents as 
soluble salts and free acids. | : 
ADDITIONAL COPIES 
OF THIS PUBLICATION MAY BE PROCURED FROM 
THE SUPERINTENDENT OF DOCUMENTS 
GOVERNMENT PRINTING OFFICE 
WASHINGTON, D. C. 
AT 
5 CENTS PER COPY 
V 
WASHINGTON : GOVERNMENT PRINTING OFFICH: 1914 
