REFERENCES 
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Conn, The Story of Germ Life. 
Frankland, Our Secret Friends and Foes. 
Prudden, The Story of the Bacteria. 
Radot, The Life of Pasteur. 
Snyder, General Science, pages 209-218. 
U. S. Bulletin No. 56, Hygienic Laboratory Bulletin. Milk and Its 
Relation to Public Health. 
Woodhead, Bacteria and Their Products. 
