22 Veterinary Medicine. 



Megnin associates it with the trichophyton of cattle as a separate 

 form. Even if the two have come originally from the same stock 

 the maintenance from generation to generation of the distinctive 

 pathogenic qualities, and the different behavior in cultivation 

 media, seem to warrant their consideration as distinct pathological 

 factors. 



The trichophyton tonsurans of the horse produces in artificial 

 cultures very abundant snowy tufts and liquefies gelatine very 

 tardily. The trichophyton epilans from the same animal pro- 

 duces at first only a thin slightly yellowish pellicle and liquefies 

 gelatine with great rapidity (Duclaux). The difference, like 

 that of the endothrix and ectothrix, is probably dependent on en- 

 vironment, transient and a temporary variety. 



Contagion from animal to animal has been .so often observed 

 and conducted experimentally that it must to-day be accepted as 

 between different genera, and no less between artificial cultures 

 iji vitro and the living animal. Gerlach and Megnin transmitted 

 the disease from ox to horse ; Reynal and Nettleship from horse 

 to calves ; Epple from goat to ox ; Gerlach and Fenger from ox 

 to dog ; Perroncito from ox to sheep ; Siedamgrotzky from 

 hor.se to dog, sheep and pig ; Zuru from dog to cat ; Fenger 

 from cat to dog, and Lespian from dog to pig. Cases of trans- 

 mission to man from the ox have been observed as early as 1820 

 by Ernst, and by thirty to forty observers .since. Transmission 

 from the horse to man was observed by Papa in 1848, and by a 

 score of observers since. Transmission from dog to man has 

 been noticed by Friedberger, Horand, Haas, Frohner, St. Cyr 

 and others. Contagion from the cat to man has been observed 

 by Leidy, Fenger, Borch and others. It is interesting to notice 

 that in this case the chain usually extended from affected mice 

 and rats to the paws and face of the cat, and thence to the chil- 

 dren who fondled the cat. Ivcspian records an epizootic in the 

 Eastern Pyrenees in which the disease was introduced into one 

 family by a dog, which first infected a pig, which in its turn in- 

 fected the family in whose house it was kept. 



Prognosis. The affection being a purely local one the prog- 

 nosis is always good. In some cases it disappears spontaneously 

 with the shedding of the winter coat and the turning on the suc- 

 culent spring pasture. Especially does it give way under suitable 



