761 
U. S. DEPARTMENT OF AGRICULTURE 
OFFICE OF EXPERIMENT STATIONS— BULLETIN NO. 153. 
A. C. TRUE, Director. 
PROCEEDINGS 
OF THE 
EIGHTEENTH ANNUAL CONVENTION 
ASSOCIATION OF AMERICAN AGRICULTURAL COLLEGES AND 
EXPERIMENT STATIONS, 
HELD AT 
DES MOINES, IOWA. NOVEMBER 1-3, 1904. 
EDITED BY 
A. C. TRUE and W. H. BEAL, for the Office of Experiment Stations, 
AND 
H. C. WHITE, for the Executive Committee of the Association. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE, 
1905. 
