Vol. V DECEIVIBER 20, 1915 No. 12 



JOURNAL OF 



AGRICUIvTURAL 



RESEARCH 



CONTENTS 



P*ge 



Biology of Apanteles militaris 495 



DANIEL G. TOWER 



Respiration Experiments with Sweet Potatoes . . 509 



HEINRICH HASSELBRING and LON A. HAWKINS 



Cherry and Hawthorn Sawfly Leaf Miner . . . 519 

 p. J. PARROTT and B. B. FULTON 



Variations in Mineral Composition of Sap, Leaves, and 

 Stems of the Wild-Grape Vine and Sugar-Maple Tree 529 



O. M. SHEDD 



DEPARTMENT OF AGRICULTURE 



WAS HINGTON , D.C. 



WA«HINaTON : OOVERNMSNT PWKTINa OFFtCE : 18»9 



