BACTERIAL INHIBITION 



531 



Three of these cows, numbers 134, 188, and 196, when tested 

 together twice (columns 4 and 5) show only an increase in growth; 

 hence the decrease in the first three columns is attributed to the 

 three cows, numbers 155, 190, and 212. The milk of the other 

 five cows, numbers 179, 180, 181, 201, and 208, when used in 

 three different combinations, shows no evidence of a germicidal 

 property. Of the eleven cows considered in table 1, only three 

 possess a germicidal power. The individual cow therefore is 

 seen to be an important factor in the study of bactericidal prop- 



TABLE 3 

 Growth of bacteria in milk, raw and inoculated with culture R, at 37°C. 



* I = Innumerable. 



erties in milk, especially if this ratio of 3 to 11 is taken as an 

 indication of the prevalence of these properties among individual 

 cows. 



To demonstrate the specificity of the germicidal property for 

 different bacteria, pure cultures were inoculated into the milk 

 of individual cows. From the results reported in table 1, cows 

 155 and 212 were selected for inoculation tests with pure cultures 

 of Bad. colt, Bad. ladis-acidi, and Culture R, according to the 

 technique reported above. The growth of the different organ- 

 isms is recorded in tables 2, 3, and 4, which show the comparable 



