INFLUENCE OF TEMPERATURE. l6l 



Some dry spores survive an exposure to 140 to 150 for ten minutes. It 

 requires a very high temperature to sterilize glass, cotton, gauze, and 

 instruments with dry heat. A discontinuous sterilization of dry material 

 is useless since the spores will not germinate without moisture, therefore 

 their resistance remains unaltered. 



The spores of molds are more resistant than the mycelium but, if 

 moist, they all die at 100. The dry mold spores can tolerate a some- 

 what higher temperature, but not as high as the spores of many bacteria. 

 Yeast spores and yeast cells are very much alike in their resistance to 

 heat. The table on page 160 shows hardly any difference between their 

 resistance. 



