EXPERIMENT STATION BULLETINS. 



461 



TABLE II. 

 Ammonia Formed in 60 g. of Sand. {Compiled from Table I.) 



In the peptone solutions there is no series which is in every distillation 

 the lowest or the highest. However, in Series III. three of the five 

 data are lower than the corresponding figures of the other five series, 

 while in Series IV. two data are the maximum numbers (see Table II). 

 The greatest deviations between these series are, at the five different times 

 1.2 cc, 1.6 cc, 1.4 cc, 2.3 cc, and 0.9 cc. respectively. This indicates 

 that the difference does not increase with the age of the culture, and 

 since it does not increase absolutely, it decreases relatively because the 

 total amount of ammonia increases. The greatest variation between 

 peptone solutions of the different series, expressed in per cents of the 



