Tinea Lophophyton Gallinis. Lophophytosis. 29 



distinguishable, but Megnin, in 1890, showed that the cultures of 

 the epiderraophyton on gelatine formed a snow-white layer, 

 which, when torn allowed the escape of a reddish fluid, that is 

 not seen in the cultures of the achorion Schonleini. In 1899, 

 cases of white-comb, investigated by Matruchot and Dassonville, 

 showed that the alleged differentiation was inconstant, the colora- 

 tion showing in the first or second cultures, but not in succeeding 

 ones ; it showed in cultures made on maltosed gelatine, and 

 scarcely at all on peptonized gelatine. Upon gelatine the growth, 

 at first white and downy, liquefies the gelatine and in a few days 

 turns it pink. Upon peptonized and saccharated jelly there is a 

 white tomentous growth, with less liquefaction and tardier and 

 less marked coloration, which ma}"- disappear altogether in the 

 third generation. The cultures of the white-comb fungus are 

 successfully and easily inoculated on chickens and rabbits, while 

 rats and dogs, which are so susceptible to the favus of man, prove 

 immune. As the term epidermophyton was already applied by 

 Lang to another fungus, the name of lophophyton (lophe, crest) 

 was adopted. 



Lophophyton Gallinae. The crusts from the affected comb 

 are treated with caustic potash solution, 40 per cent., when the 

 mycelium comes out clearl}', especially if tinted pink. Many of 

 these are mere filaments devoid of protoplasm, but others contain 

 refrangent protoplasm, globular, with abrupt square ends, or ar- 

 ranged in a continuous chain in the middle or end of a filament 

 and giving it a fusiform outline. These are called chlamydo- 

 spores (cloaked spores). In the rabbit they resemble the tri- 

 chophyton ectothrix of the circinate ringworm of the ox. 



Symptoms. The prominent symptoms are the dirty white 

 discoloration of the comb or wattles, with the presence on the 

 surface of a dry, powdery crust, which may grow to a thickness 

 of several millimetres. When produced experimentally by rub- 

 bing the comb with the powder from a diseased bird it develops 

 in about fifteen days a white powdery patch in points of from a 

 pin's head to about one-third inch in diameter. This gradually 

 extends, adjacent centres become confluent, and in some weeks it 

 may have invaded the whole comb, wattles, head and a great part 

 of the body. Circumscribed areas of the ringworm may be dis- 

 covered on the body as early as on the comb, in casual cases, if 



