642 CONTRIBUTIONS TO OUR KNOWLEDGE OF SOIL-FERTILITY, xiii., 



could only occur through the production of bacteriotoxin, the 

 toxic effect was not sufficient to show a direct toxicity. With 

 dextrose, the case was different. The toxicity was so great as 

 to completely overshadow any nutritive action on the ninth day. 

 Further tests were made, but the results were irregular. 



EXPERIMKNT 12/11/14. 



It appeared possible that aeration of the soil might hasten the 

 production of toxin, and, accordingly, a current of air was passed 

 over the soil contained in bottles. 



The aeration of the soil containing dextrose did not appear 

 to assist the formation of toxin, and, accordingly, further tests 



