PASTEURIZATION OF MILK. 165 



their living actions, which are not destroyed by the heat 

 applied.* 



Fortunately these substances appear very rarely in milk, 

 and seem to originate from bacteria thriving best in dark, 

 filthy, and poorly-ventilated places. Sterilization of the 

 milk does not, therefore, render it unnecessary to observe as 

 great cleanliness and care as possible in the production and 

 handling of the milk. 



* As an example it may be mentioned that a poisonous principle 

 (tyrotoxicori)i& sometimes found in milk (see " Hygisea," 1888, p. 695). 

 In the case quoted it had arisen after the milking, in milk kept in a 

 building with poor ventilation, the grounds of which were exposed 

 to contamination from a neighboring slaughter-house. The milk 

 caused a cholera-morbus-like disease in children. Boiling or sterili- 

 zation did not diminish the injurious effects of the milk. See also 

 Flugge, "On Sterilization of Milk," Zeitschr.f. Hyg., 17 (1894), pp. 

 272-342. 



