184 



DISK ASKS or POULTRY. 



and the wings themselves, that are found diseased. 

 The apjiearance of the affected parts resembles 

 closely that seen in favus— the disease caused by the 

 vegetable parasite known as the Achorion Schojilcinii. 

 Some have, therefore, suspected that the disease is 

 reallj' due to this fungus and that the mites are inno- 

 rent of pathogenic action. The truth must be de- 

 t.^rrained b}' future investigations. 



SCABIKS CAUSED BV 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 lo l>e a frequent af- 

 fection of fowls. It is 

 caused by the mite known 

 as the Sarcoptes Iccvis. The 

 parasite found on the pig- 

 eon is not exactly the same 

 as that found ui)on fowls 

 although both belong to the 

 same species. The varietj- 

 which lives upon the pigeon 

 is distinguished by the term 

 columbce, and that which 

 lives upon fowls In' the 



of the fowl;" male, seen on tiie +pj-m p-al I i )UP The disease 

 ventral surface; ma<?nified 150 leriu ^^a/////« . J. lie UlbCd^e 



diameters. jg niost coHimon iu 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 



Fii.'- 48.— £'//(/.r/«<)//i>- H/obalua 



