U. S. DEPARTMENT OF AGRICULTURE, 



DIVISION OF PUBLICATIONS. 



(dB.6(d (13) 



DEPARTMENT BULLETINS 

 Nos. 251-275, 



WITH CONTENTS AND INDEX. 



PREPARED UNDER THE SUPERVISION OF 



JOS. A. ARNOLD, 



EDITOR AND CHIEF. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1917. 



