Vol. XH JANUARY 21, 1918 No. 3 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONXKNTS 



Page 



Irrigation Experiments on Apple-Spot Diseases - - - 109 

 CHARLES BROOKS and D. F. FISHER 



( Contributkin from Bureau of Plant Industry ) 



Relation of Carbon Dioxid to Soil Reaction as Measured 



by the Hydrogen Electrode - - - - - - 139 



D. R. EOAGLAND and L. T. SHARP 



( Contribution from California Agricultural Experiment Station) 



PUBUSHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE. 



WITH THE COOPERATION OF THE ASSOCIATION OF AMERICAN 



AGRICULTURAL COLLEGES AND EXPERIMENT STATIONS 



WASWINOXOM, E). C. 



WASHmOTON ■■ OOveRNMtHT piflNTlNO OKFIC" 



