YEASTS AND MOLDS 213 



ments are matted tagether, and radiating outward from this 

 zone are club-shaped branches, as the petals of an aster. In the 

 center of the granule are numerous cocci-like bodies, and some 

 of the ovoid or club-shaped hyphae lie detached from the 

 clusters. Through cultivation it was 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 



Fig. 129. Actinomyces granule crushed beneath a cover-glass, showing 

 radial striations in the hyaline masses. Preparation not stained; low magnify- 

 ing power (Wright and Brown). 



dry and prominent, margins hyaline, composed only of fila- 

 ments, short and long, massed together, but no clubbed forms. 



By some the clubs are considered the spore organs; by others, 

 they are thought to be encapsulated or thickened filaments. 



Patho genesis. When a portion of the growth obtained in 

 eggs was injected into the abdominal cavity of a rabbit, actino- 

 mycotic processes developed 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. 



