YEASTS AND MOLDS 



22 9 



it is found that the ovules give rise to filaments, and 

 they then form the ovules again. 



Cultivation. At 38 C. on glycerin-agar in a period of one 

 to two weeks pointed scales about the size of a millet-seed, 

 center dry and prominent, margins hyaline, composed only of 

 filaments, short and long, massed together, but no clubbed 

 forms. 



The clubs have been considered as spore organs; by 



Fig. 113. Actinomyces granule crushed beneath a cover-glass, show- 

 ing radial striations in the hyaline masses. Preparation not stained; 

 low magnifying power (Wright and Brown). 



others, they are thought to be encapsulated or thickened 

 filaments. 



Patho genesis. When a portion of the growth obtained in 

 eggs is injected into the abdominal cavity of a rabbit, 

 actinomycotic processes develop upon the peritoneum. 



It usually gains access to the living body through a wound 

 in the gum or some caries of the teeth. A new growth is 

 formed, ulceration being first set up. 



The new tissue, composed of round-cells, then undergoes 



