MARKET MILK BUSINESS OF DETROIT, MICH., IN 1910. 17 
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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. 
