TYPHOID FEVER IN DISTRICT OF COLUMBIA. 85 ' 
cocci, and the bacillus of pseudodiphtheria. These are organisms 
which are concerned in the production of inflammatory reactions. 
The bacteria gaining access to the milk during milking and from 
various outside sources are the lactic acid bacteria and the putrefac- 
tive bacteria. The lactic acid bacteria, according to Bergey, consist 
of several varieties, such as B. acidi lactici, B. lactis, M. acidi lactici, 
and B. coli communis. 
Park°^ found that milk taken from a number of cows in which 
almost no outside contamination had occurred contained, as a rule, 
very few bacteria, and these were streptocci, staphylococci, and 
other varieties of bacteria not often found in milk sold in New York 
City, the temperature at which milk is kept being less suitable for 
them than for bacteria /hich fall into the milk from dust, manure, etc. 
a Park, William Hallock: Pathogenic micro-organisms, including bacteria and pro- 
tozoa; a practical manual for students, physicians, and health officers. New York, 
Lea Brothers & Co., 1905. 
