725 



U. S. DEPARTMENT OF AGRICULTURE. 



OFFICE OF EXPERIMENT STATIONS— BULLETIN NO. 149. 



A. C. TRUE, Director. 



BY 



C. D. ^VOODS, 



Director, Maine Agricidtural Experiment Station, 



AND 



E. R. MANSFIELD, 



Assistant L'heniist, Maine Agricultural Experiment Station. 



LIBRARY 

 eW YORK 

 TANICAL 



RDEN. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE, 



1904. 



