62 



MICROSCOPICAL DIAGNOSIS. 



the many shapes characteristic of the achorion Schonleinii. They 

 may be single or two or more may be united together. 



Tinea Tonsurans. The fungus is the same as in the last 

 named disease, but it exists in a different stage of its develop- 

 ment. In tinea circinata the epidermis is the seat of the dis- 

 ease while in tinea tonsurans the hair is involved. In the lat- 

 ter disease the spores exist in vast quantities. The hairs are 

 thoroughly invaded with them, not only around the outside of 

 the bulb and root, but also inside the hair structure. They 

 are many times placed in rows corresponding to the filaments 



Fig. 19. Sar copies Hominis (male). 



of the hair. The outline of the hair is seen to be ragged in 

 places, owing to the protruding of the filaments of the fungus. 

 The fungus may be sufficiently abundant to. completely disin- 

 tegrate the hair. Taylor says that this fungus invades the hair 

 down to the bulb, but that it never advances to any distance 

 in this structure, neither does it attack the hair papilla or root 

 sheaths. To examine for the fungus one or two of the short 



