176 THE MORE CHRONIC INFECTIOUS DISEASES 



threads are about 75 J 00 to sTFFo mcn w ide, their 

 length being very variable. The bulbs measure from 

 60000 t 30^0 mcn in width and vary in length. They 

 grow with reasonable freedom in the laboratory, 

 especially upon media containing animal substances 

 such as blood serum. Their optimum temperature is 

 40 C. or 102 F. They are killed at 75 C. or 167 

 F. exposed ten minutes. They resist drying for a 

 long time. They are extremely resistant to chemical 

 disinfectants. Not all animals are susceptible to 

 actinomycosis, but those contracting it present about 

 the same type of lesions. Nothing in their blood serum 

 is of any value in treatment of human beings. Vaccines 

 are not used. 



THE PACIFIC COAST JOURNAL 

 OF NURSING 



