534 



WILLIAM H. CHAMBERS 



sented by the raw milk curve of chart 2, i.e., a growth in which 

 there is no decrease in numbers but a definite lag phase preceding 

 the logarithmic increase, is found in the majority of the uninocu- 

 lated raw milk samples (table 1, columns 4, 5, 6, 7, and 8, and 

 all the uninoculated controls of tables 2, 3, and 4). Consider- 



Bact. per o.c. 

 (logs.) 



6.75 



6.25 



5.75 



5.25 



4.75 



Hours 2 2 3 4 



Chart 2. Growth of Bacteria in Milk Inoculated with Culture R at 37°C. 



ing the number of different species of bacteria represented in 

 the uninoculated raw milk samples, this would seem to be a 

 more common type of growth in raw milk than the germicidal 

 type. 



Table 4 shows practically no difference in the rate of multi- 

 plication of Bad. lactis-acidi in the raw milk and in the heated 



