208 THE MANAGEMENT AND DISEASES OF THE DOG 



uncleanliness, neglect in hygibne, 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 in- 

 fected 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 and in the hair-follicle, each favus- 

 cup being pierced near its centre by a hair. At first ihs,favi 

 are merely yellow specks. 



" When the malady is of some duration, it is characterized 

 by one or more masses of irregular crusts, more or less fis- 

 sured, of a somewhat pitchy consistency, offering, when 

 broken, a fine granular structure, and having a bright yellow 

 color, like sulphur. They affect a remarkable disposition ; 

 their contour, sometimes very circular, at other times more or 

 less notched, forms a slight prominence that rises a little above 

 the surrounding skin ; their centre is, on the contrary, to a 

 greater or less degree concave ; the conformation that gives 

 the crust the aspect of a cup. 



" These capsules, orfavi, are more or less numerous, and 

 more or less extensive. At the free surface of the crusts 

 there are often found dry, bristly hairs that appear to pass 

 through the entire thickness of the favous mass, and are easily 

 pulled out. At a later period, these hairs are shed from the 

 follicles — not broken off, or sharply cut away close to the 

 crusts, as in Tinea tonsurans. 



" If the crusts are carefully removed, the skin beneath 

 is observed to be thin and depressed, and looking as if 



