212 



BACTERIA 



he states that a temperature of 158° F. (70° C.) maintained 

 for thirty minutes will kill the specific organisms of tubercle, 

 diphtheria, typhoid, and cholera. MacFadyen and Hewlett 

 have demonstrated/ by sudden alternate heating and cool- 

 ing, that 70" C. maintained for half a minute is generally 

 sufficient to kill suppurative organisms and such virulent 

 types of pathogenic bacteria as Bacillus diphthericB, B. 

 typhosus, and B, tuberculosis. 



Respecting the numerical diminution of microbes brought 

 about by pasteurisation and sterilisation, respectively, we 

 may take the following two sets of experiments. Dr. N. 

 L. Russell" tabulates the immediate results of pasteurisation 

 as follows : 



' Jenner Institute of Preventive Medicine (First Series Transactions), 

 '^ Ceniralblatt fiir Bakteriologie, etc., II, Abteilung, 



