iToL. XXII NOVEMBER 12, 1921 No. 7 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONTENTS 



Page 



Genetic Behavior of the Spelt Form in Crosses between 

 Triticum spelta and Triticum sativum- - - - 335 



CLYDE E. LEIGHTY and SARKIS BOSHNAKIAN 



( Contribution from Bureau of Plant Industry ) 



Plum Blotch, a Disease of the Japanese Plum Caused 

 by Phyllosticta congesta Heald and Wolf - - - 365 



JOHN W. ROBERTS 



( Contribution from Bureau of Plant Industry ) 



A Comparison of the Pectinase Produced by Different 

 Species of Rhizopus - - "" ~ " -371 

 L. L. HARTER and J. L. WEIMER 



(Contribution from Bureau of Plant Industry) 



PUBUSHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE, 



WITH THE COOPERATION OF THE ASSOCIATION OF 



LAND-GRANT COLLEGES 



WASHINGTON, D. C. 



GOVERNMENT PRINTING OFFICE 



1921 



