MILTON J. ROSENAU 



405 



These and similar bizarre results soon give way to careful work with pure cultures, 

 for it was disclosed by the early bacteriologists that the tubercle bacillus has no spore 

 and is but little more resistant than the ordinary spore-free bacteria. 



Schroeder (1894), Theobald Smith (1899), Russell and Hastings (1900), Hesse 



CHART I 



M I N UTES 



Time and Temperature for Pasteurization in the Neutral Zone Which 

 Is ABOVE the Thermal Death-Curves for the Pathogenic Micro- 

 organisms with Minimum Injury to the Milk. 

 (U.S. Pub. Health Bull. 147, 1925.) 



