16 



Optimum temperature of saprophytic bacteria, 



that of the room, or summer, 25 to 30 C. 

 Optimum temperature of parasitic bacteria, that of 



the body, about 37.5 0. 

 Influence of cold of heat, 70 and above. 

 Growth of some bacteria at 0. At 50, 60, 70 C. 

 Injurious action of diffuse light, and especially of 

 sunlight. 



LABORATORY WORK. Continuation of that of preceding 

 day. 



