492 



RIICRO-ORGANISJMS AND DISEASE [CHAr. 



mass or masses of these radiating aggregations of clubs. 

 But also in the human disease the clubs are with few 

 exceptions present, though there are cases described in 

 which the fungus was said to have been represented only by 

 a dense felt-work of branched fine threads. 



Examining sections of hardened actinomyces nodules, 

 after suitable staining (rubin, 2 per cent, watery solution, 



Fig. 197. - From a section through a nodule of the tongue of an ox, showing tlie 

 central mass of the ray fungus. Low magnifying power. 



for several hours, then washed in water and stained in 

 methyhblue anilin water for fifteen to thirty minutes) the 

 ray fungus appears in the middle of the nodule as an 

 irregular, spherical, or, more commonly, particularly when 

 large, a lobed mass, composed of a central, faintly stained, 

 homogeneous, or faintly granular mass ; around this is a 

 zone deeply stained in blue, and owing to its being com- 

 posed of densely aggregated and twisted branched threads 



