54 MILK AND THE PUBLIC HEALTH CHAP. 



The writer has carried out l an extensive series of experi- 

 ments to study the rate of growth of B. coli and its allies in 

 ordinary market milk, kept under different conditions of time 

 and temperature. The following table shows the multiplication 

 of B. coli in milk collected at the byre and examined at once 

 and under definite conditions. 



For convenience of study the results are divided into five 

 groups according to the initial number of B. coli and allied 

 organisms and are summarised in the following two tables : 



1 Report of Medical Officer, Local Government Board, 1909-10, p. 474. 



