MARKET MILK BUSINESS OF DETROIT, MICH., IN 1915. 17 



Fig. 7. 



-System of city distribution of market milk in Detroit after compulsory 

 pasteurization. 



handling from 40 to 1,500 gallons daily. Only a few of the smaller 

 plants were equipped with steam boilers, the greater portion using 

 gas heaters to furnish hot water for washing the milk bottles and 

 utensils. Forty-four dealers purchased pasteurized milk in bulk 

 from 23 other dealers, which they bottled and sold to both retail and 

 wholesale trade. 



The records of the Detroit Board of Health showed higher bacterial 

 counts in milk pasteurized by the flash method than that pasteurized 

 by the holding method. The pasteurized milk which was purchased 

 from other dealers often showed higher bacterial counts than the 

 samples of the raw milk before pasteurization. The bacterial counts 

 were usually higher in the pasteurized milk purchased from other 

 dealers for bottling than in that which was pasteurized and bottled in 

 the same plant. 



AFTER COMPULSORY PASTEURIZATION. 



The pasteurization ordinance which became effective May 1, 1915, 

 required that all milk be pasteurized by the holding process in plants 

 equipped in accordance with regulations adopted by the milk- 

 inspection department of the city board of health. 



