HIGHER BACTERIA 371 



Neumann 28 has described the trichophytons causing ring- 

 worm in domestic animals. In addition to these he found 

 Microsporum Audouini Gruby to be one of the causes of ring- 

 worm. The trichophytons which he discovered as the cause of 

 ringworm are briefly described as follows. 



Trichophyton mentagrophytes (Ch. Robin). This is a 

 pyogenic trichophyton, producing white cultures (Sabouraud). 

 The mycelium may be divided into spores measuring 5 to 6 /* 

 in diameter but of very irregular length, particularly towards 

 the periphery of the hair (from 2 to 3 mm. up to 10 or 11 

 mm.). 



Trichophyton flavum (Bodin). This tricophyton pro- 

 duces yellowish, wrinkled cultures (Sabourand). The my- 

 celium may be divided into ovoid irregular cells from 5 to 6 ju 

 in size ; occasionally some may be found to be 11 //, in length. 



Trichophyton equinum (Gedoelst). This consists of an 

 intrapilary mycelium composed of oval spores of from 4 to 6 //, 

 in length and 2 to 4 /A in width. Surrounding the hair are 

 ramifying mycelial filaments with numerous septa and few 

 spores. 



Trichophyt'on verrucosum (Bodin) var. equi. This is a 

 faviform trichophyton producing brown, heaped-up, irregular 

 cultures (Bodin). The mycelium rapidly breaks up into 

 spherical spores with a double contour. Endo- ectothrix. 



Trichophyton verrucosum (Bodin) var. asini. This is a 

 form of trichophyton producing gray cultures. The mycelium 

 breaks up into regular chains of spherical cells. 



Microsporum Audouini. The mycelium of this fungus 

 found in the hair appeared as axial bundles of filaments, 2 to 

 2.5 /x in diameter with well marked septa. These filaments 

 give off at right angles fine branches which pass to the exterior 

 where they produce conidia. They grow around the hair from 

 its base to a height of from 1 to 3 mm. They render the hair 

 grayish in color and fragile. 



28 Neumann. Jour, of Comp. Path, and Therap., Vol. XVIII 

 (1905) p. 193. 



