Vol. VI AIPRIL lO, lOlG No. 2 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONTENTS 



Soluble Nonprotein Nitrogen of Soil 61 



R. S. POTTER and R. S. SNYDER 



Oviposition of Megastigmus spermotrophus in the Seed of 



Douglas Fir 65 



J. M. MILLER 



Citrus Canker 69 



FREDERICK A. WOLF 



DEPARTMENT OF AGRICULTURE 



WASHINGTON, D.C. 



'. U'WUBHamBOB 



WASHINOTON : OOVERNMCNT PRINTINa OFFICI : tBI» 



