112 



MICRO-ORGANISMS AND DISEASE. [CHAP. 



independently of free access of air. The spores are oval, and 

 differ in thickness according to the thickness of the bacilli 

 they are formed in. The bacillus is found occasionally in 

 the blood-vessels of man and animals after death. In a 

 nourishing fluid, in which micrococcus, bacterium termo, or 

 bacillus subtilis grows, they have no chance of growing, 

 and even when numerous at first they soon disappear. 



Fie;. 48. STREPTOTHRIX FOERSTERI 

 (AFTER COHN). 



FIG. 49. CLADOTHRIX DICHOTOMY 

 (AFTER COHN). 



(d) Streptothrix and Cladothrix. Cohn * found in a 

 concretion of the human lacrimal canals long, pale, smooth, 

 apparently branched threads, either straight or twisted ; they 

 were finer than the threads of leptothrix buccalis ; he called 

 them Streptothrix Foersteri. They are probably identical 

 morphologically with Cladothrix dichotoma. This latter 

 1 Beitr. z. Biol. d. Pflanzen, vol. i. p. 186. 



