Vol. XVIII KKBRUARY 16, 1920 No. lO 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONXKNXS 



Vtif* 



Determination of Normal Temperatures by Means of the 

 Equation of the Seasonal Temperature Variation and a 

 Modified Thermograph Record ----- 499 

 F. L. WEST, N. E. EDLEFSEN, and S. EWING 

 (Contrltratlon from Utah Agrlcultaral Bzpeilment Station) 



Temperature Relations of Certain Potato-Rot and Wilt- 

 Producing Fungi -------- 511 



H. A. EDSON and M. SHAPOVALOV 



(Contribution (rom Buimo of Plant Induttry) 



Germination of Barley Pollen ------ 525 



STEPHEN ANTHONY and HARRY V. HARLAN 

 ( Contribution from Bureau of Plant Industry ) 



Invertase Activity of Mold Spores as Affected by Concen- 

 tration and Amount of Inoculum ----- 537 

 NICHOLAS KOPELOFF and S. BYALL 



(Contribution from Louisiana Agricultural Experiment Station) 



Basal Glumerot of Wheat ------ 543 



LUCIA Mcculloch 



(Contribution from Bureau of Plant Industry) 



PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE. 



WITH THE COOPERATION OF THE ASSOCUTION OF 



LAND-GRANT COLLEGES 



WASHINOTON, D. C. 



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