Vol. V OCTOBER IS, 1915 No. 3 



JOURNAL OF 



AGRICULTURAL 



RESEARCH 



CONTENTS 



Pago 



Enzyms of Apples and Their Relation to the Ripening 

 Process 103 



R. W. THATCHER 



An Automatic Transpiration Scale of Large Capacity for Use 

 with Freely Exposed Plants . . . . . .117 



LYMAN J. BRIGGS and H. L. SHANTZ 



Parasitism of Comandra umbellata . . . . .133 

 GEORGE GRANT HEDGCOCK 



Separation of Soil Protozoa 137 



NICHOLAS KOPELOFF, H. CLAY LINT, and 

 DAVID A. COLEMAN 



DEPARTMENT OF AGRICULTURE 



\\^SHINGTON, D.C. 



WASHINGTON : QOVERNMENT PRINTINO OFFICE : 191f 



