76 



Journal of Agricultural Research 



Vol. XIX, No. 3 



3*~ 



/QO 

 O 



eo CO 40 20 o 



cc 0.//\/ C/fr/c Acid per Liter 

 20 40 60 60 /OO 



CC. 0./ A/ NaOH per Lifer 



3 -4 5 6 



Cu/ft/re A/ umber 



Fig. 1. — A, graph showing the relation of reaction to the contents of HaCsHsO? and NaOH employed in the 

 cultures of series A; B , graph showing the change of reaction found after 4 days' growth of wheat seed- 

 lings iu series A. 



