Vol. XX MARCH 15. 1921 No. 12 



JOURNAL OF 



AGRICULTURAL 



RESEARCH 



CONTENTS AND INDEX 

 OF VOLUME XX 



PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE. 



WITH THE COOPERATION OF THE ASSOCIATION OF 



LAND-GRANT COLLEGES 



WASHINGTON, E>. C. 



WAtHIHOTON : GOVERNMENT PHINTINO OFPICS : l»SI 



