Demodecic Scabies. 211 



quill and shaft. The congestion and irritation of the skin is 

 moderate, the normal smoothness, thinness and suppleness being 

 often retained, but debility and emaciation set in, the yield of 

 eggs is lessened and the flesh loses in flavor. 



The disease spreads from bird to bird with great rapidity, 

 largely, it would appear, through the cock in treading, and may 

 attack a whole flock in a few days. Neumann has observed that 

 it is much more marked in spring and summer and subsides in 

 great measure in autumn and winter. 



Treatment. Dry dust baths in covered boxes, and having a 

 liberal admixture of sulphur, phenol, insect powder or powdered 

 stavesacre will often suffice. If not, the parts may be rubbed 

 with sulphur ointment, or the exposed skin sprayed with 

 bisulphide of carbon. Disinfection of nests and roosts is desira- 

 ble. 



DEMODECIC SCABIES. 



Demodex, worm-like, in hair follicles and sebaceous glands. Demodex 

 FoUiculorum V. hominis, in human nose, etc., causing comedon. De- 

 modex FoUiculorum v. Canis, in eyelids, toes, elbows, hocks, or body of 

 dog. Redness, circular depilation, papules, scurf, skin thickened, puckered, 

 bald, large papules, pustules, bluish red or pink with whitish centre. 

 Cheesy or pus-like sebum pressed out and cleared by ether shows acari. 

 Susceptibility : Youth, short hairs, unexplained personal proclivity. May 

 pass to man. Treatment : Dissolve sebum by carbon bisulphide, benzine, 

 phenol, lysol, potassium sulphide, Peru balsam. Sulphur internally. D. 

 Folliculorum v. Suis : Attacks snout, neck, breast, axilla, abdomen, groin, 

 etc. ; 1000 in follicle, abscess, millet-seed to hazelnut ; become confluent. 

 Treatment as in dog. D. Folliculorum v. Caprse : On sides of body and 

 flanks ; nodules, pea, hazelnut filled with sebum and acari. D. Follicu- 

 lorum V. Ovis in Meibomian glands of sheep, causing conjunctivitis. D. 

 Folliculorum v. Bovis : Sh'Tt abdomen, long rostrum and cephalo-thorax. 

 Found in muzzle and hides of cattle, resulting abscesses ; hurt value of skin. 

 D. Folliculorum v. Equi : Found in Meibomian glands and upper lip of 

 horse. 



This form of acariasis is characterised : ist, by the vermiform, 

 outline of the parasite, the abdomen of which is prolonged in the 

 form of a worm (demodex wormlike) ; and 2nd, by the habitat 

 of the parasite in the hair follicles and sebaceous glands of the 

 skin. The specific name of Demodex Folliculorum has been given 



