200 YEASTS AND MOULDS 



hairy portions, Tinea tonsumns or Tinea sycosis. This 

 is due to the Trichophyton of various species, depending 

 upon the size of the spores. It is commonest in children 

 in schools, and appears also where uncleanliness pre- 

 vails, as evidenced by epidemics from a badly kept 

 barber shop. The fungus grows into the hair sheath 

 and inflames its base. The disease appears charac- 

 teristically as circular, scaly patches, which are rapidly 

 denuded of hair. This disease, as far as known, is 

 only transmitted from man to man. 



Favus. This disease is caused by a mould called 

 Achorion Schonleinii, and affects chiefly the hairy 

 portions of the body. Animals as well as man are 

 affected, and while it is usually transmitted from 

 person to person, it is not uncommonly contracted by 

 fondling affected cats and dogs. Debilitated persons 

 are most susceptible. The fungus penetrates the hair 

 shaft, sets up a little inflammation which slowly spreads, 

 and is soon covered with a curious sulphur-yellow 

 concave crust called a scutulum. The place becomes 

 bald because the nutrition of the hair is cut off. Some 

 cases are on record where this fungus has spread to 

 all the tissues of the body, doing damage by the 

 irritation of its presence. 



Thrush. Thrush or soor is a disease caused by the 

 O'idmm. albican-s, and is characterized by the presence 

 of small white patches on the mucous membrane, 

 usually of the mouth, in unclean or illy nourished 

 children. It may be found in the vagina. It has been 

 known to spread throughout the body. 



Pityriasis Versicolor. This is a disease chiefly of 

 unclean persons produced by the development of 



