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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt:... lesser degrees of heat varies with the microorganism. Thus, the restraining action for B. lactla a-rogenes is weakened by first heating the milk at 55 C. and almost destroyed at 60 C.; for typhoid it is not affected by heating the milk at 60 C. for twenty minutes, but is materially influenced at 70 C. for thirty minutes. The " germicidal " action of milk varies in different animals and in the milk from the same animal at different times. At most, the action is variable and feeble. It can not take the place of cleanliness and ice, but may be taken advantage of in good dairy methods. 13. THE SIGNIFICANCE OF LEUCOCYTES AND STREPTOCOCCI IN MILK. THE SIGNIFICANCE OF LEUCOCYTES AND STREPTOCOCCI IN MILK. By William Whitfield Miller," Assistant Surgeon, Public Health and Marine-Hospital Service. In the search for better and simpler methods for detecting milk from diseased cows, especially when mixed with the milk from healthy cows, as may be the case in market milk, particular attention lias been paid to the presence of leucocytes and streptococci. In America, and to some extent abroad, much work has been done by State and city health authorities in the examination of dairy milk, with a view to determining the significance of these elements, and fixing standards limiting their number in acceptable dairy milk. It was early observed that in the milk of cows with udder disease of an inflammatory nature, pus cells and streptococci were almost invariably present in large numbers. Following this observation, examinations were made to determine how often leucocytes and streptococci were present in market milk. The result showed that they were present in the majority of milks to a greater or less extent. They were not so numerous, however, as in the milk of...