ACKNOWLEDGMENTS* 



This bulletin is not intended to appear as an 

 exhaustive treatise on the subjects presented, but its 

 aim is to serve as a brief guide for those who are in 

 need of such information. 



Professors W. H. Lawrence and A. L. Melander of 

 the State College have very kindly furnished the 

 articles for this publication, which are credited to 

 them, and what they have to say is fresh and up to 



date. 



Main Lib. 



AGR1C, DEPT. 



