6o 



MICROSCOPICAL DIAGNOSIS. 



magnifying power of about four or five hundred diameters is 

 sufficient to show the features already described. 



Cases of tinea have been treated per ora for months and 

 even for years without benefit, when had a correct diagnosis 

 been made and anti-parasitic remedies applied directly to the 

 parts affected, the cure would have been a question of a few 

 weeks. 



Fig 16. Hair in Tinea Tonsurans. 



Tinea circinata, tinea tonsurans, and tinea sycosis, are caused 

 by a vegetable parasite known as the trycophyton fungus. This 

 fungus consists of mycelium and spores which vary a trifle in 

 each of the three affections. 



Tinea Circinata^ ringworm of the scalp. In this affection the 

 mycelium is most abundant and is embedded in the epidermic 

 cells. It consists of very long, slender threads, having a sharp 

 outline and containing spores and granules. A single thread not 

 unfrequently extends entirely across the field giving off branches 

 in every direction. The spores of the fungus in tinea circinata 

 are highly refractile bodies of a pale-green or grayish-color. 

 They are small and round or rounded. They never assume 



