Vol. XVIII TvIARCH 15, 1920 No. 12 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONTENTS AND INDEX 

 OF VOLUME XVIII 



PUBUSHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE, 



WITH THE COOPERATION OF THE ASSOCIATION OF 



LAND^RANT COLLEGES 



WASHINOXON, r>. C. 



' WAtHINQTON : QOVENNMCNT rRINTINQ OFFICE : Itil 



