EXPERIMENT STATION BULLETINS. 



365 



production in dextrose solution inoculated with soil (Ralin, Central- 

 blatt f. Bakteriologie II, Bd. 20, p. 39). 



ACID PRODUCTION IN DEXTROSE SOLUTION WITH SOIL. 



The eight plots are from the same soil treated in different ways: the 

 kind of ti'eatment is immaterial for this demonstration and may be 

 looked up in the original. Since the soil contained lime, the titration 

 was not begun until the fifth day and from the fifth to the sixteenth 

 day, the rate of acid production is so remarkably constant that one 

 would hardly take the lines of Figure 14 for fermentation curves. The 

 increasing rapidity of the acid production is only shown in the first 

 five days. Instead of the point of inflection, we have a straight line. 



This seems to be the case in all solutions with a small amount of food. 

 Fig. 15, e. g., shows the ammonia production of bacteria in a solution of 

 peptone in distilled water. 



Fig. 14. Acid Production in Dextrose Solution by Soil. 



