2O2 



BACTERIA 



which they are discharged. The colonies in tissues are often i mm. 

 in diameter, and made up of many clubbed-shaped threads radi- 

 ally situated. Through the periphery and extending beyond are 

 other unclubbed threads, while scattered throughout the colony 

 and beyond it, and in the threads, may be seen many spore-like 

 bodies. The threads and spores stain by Gram's method, while 

 the clubs do not. Basic stains also color all the elements. The 

 spores do not stain like bacterial endo-spores. 



FIG. 71. Actinomyces bo vis. (Williams.) 



Vital Requirements. It is a facultative aerobe, and grows best 

 in the presence of air, at 37 C. Resists drying for a long time, 

 and its thermal death-point is 80 C. after fifteen minutes exposure. 

 Chemical Activities. Slowly liquefies gelatine, does not curdle 

 milk; and produces a mouldy odor. No gas or acids are formed, 

 nor is H 2 S developed. 



Habitat. It has been found in straw and hay, but never in a 

 healthy body. 



