184 



DISEASES OF POULTRY. 



and the wings themselves, that are found diseased. 

 The appearance of the affected parts resembles 

 closely that seen in favus — the disease caused by the 

 vegetable parasite known as the Achorion Schonleinii. 

 Some have, therefore, suspected that the disease is 

 really due to this fungus and that the mites are inno- 

 cent of pathogenic action. The truth must be de- 

 termined by future investigations.. 



SCABIfiS CAUSED BY SARCOPTES — DEPLUMING SCABIES. 



This form of scabies was first observed by Railliet 

 and Cadiot, in 1885, on a Homing Pigeon from Brus- 

 sels. It was later found by 

 Railliet to be a frequent af- 

 fection of fowls. It is 

 caused by the mite known 

 as the Sarcoptes Icevis. The 

 parasite found on the pig- 

 eon is not exactly the same 

 as that found upon fowls 

 although both belong to the 

 same species. The variety 

 which lives upon the pigeon 

 is distinguished by the term 

 columbtB, and that which 



Fiff. ^.-Efidermoptes bilobaUi, li^CS UpOU fowls by the 

 of tbe fowl: male, seen on t'le 4-o,-«, ^^7IJ^ ^ T^t,,^ Jiz^ .„ 



ventral surface; ma-aiHed ISO term gallince . The disease 

 diameters. jg most cotnmou in Spring 



and Summer, disappearing in the Fall when the birds 

 molt, and is seen again towards Spring. 



The principal symptom of this trouble is a loss of 

 feathers from spots of various sizes, situated on differ- 

 ent parts of the body. The feathers break off at the 

 surface of the skin, and at the root of the feather is 

 seen a small mass of epidermic scales which is easily 



