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Diseases of the Skin—External Parasites. 213 
the disease very speedily, and promptly checks its exten- 
sion. 
“If there is any emaciation, tonics may be necessary.”* 
RINGWORM (HONEYCOMB). 
But little is known of this species of ringworm as affect- 
ing the dog. The disease, like the former, is due to the 
presence of a fungus, the Achorion Schonleinii, or Favus 
Tinea favosa, ‘The parasite is situated in the hair follicle, 
external to the layer of epithelium which covers the root 
of the hair. It has a peculiar mousy odour, or, according 
to others, that resembling cat’s urine. 
The causes giving rise to this affection are supposed to 
be uncleanliness, neglect in hygiene, and certain peculiar 
and humid conditions of the skin. 
Symptoms.—Fleming observes: “The disease may 
appear in any part of the body of animals, according to the 
point of infection. It affects mice generally ; but cats 
which are infected from them usually have it first at the 
base of the claws of the fore-feet. In the dog it has been 
seen on the head, and it usually affects the head in the 
human species. In the rabbits I saw diseased the parasite 
was at first on the nose and face, but gradually extended 
towards the shoulders, 
“The disease commences with an increased proliferation 
of epidermic cells, and soon after a little white sub- 
epidermic speck becomes visible, which quickly develops 
into a favus-cup—the developed fungus. As the elements 
of the latter grow, they collect about the hair-follicle, each 
favus-cup being pierced near its centre by a hair. At first 
the avi are merely yellow specks. 
_ “When the malady is of some duration, it is character- 
ised by one or more masses of irregular crusts, more or less 
fissured, of a pitchy consistency, offering, when broken, a 
* Fleming’s “ Veterinary Sanitary Science,” vol. ii. p. 471. 
