242 THE DISEASES OF THE DOS. 



spores of pathogenic fungi may be transported through the 

 air. The nidus of growth somewhat affects the characters 

 and habits of the fungus, especially as regards luxuriance ; 

 thus St. Cyr has shown that the dog is particularly liable 

 to favus. It has been stated that the ringworm fungus of 

 the dog has larger spores than that of the horse, does not 

 disappear from the skin spontaneously, and will not 

 develope on the ox, although that of the ox readily 

 developes on the dog. The incubation of these vegetable 

 parasites varies from eight days to a fortnight ; they belong 

 to the genus Achorion v. Trichophyton, and the disorders 

 to which they give rise are termed Tinese. They are 

 not frequent in the dog nor severe, and readily yield to 

 treatment. Fleming relates a case ('Veterinary Journal,' 

 vol. i, p. 207) in which it was obtained from a horse. 



Tinea Tonsurans v. Eingworm is not common in the 

 dog ; it was first noticed as affecting that animal by 

 Gerlach. It is denoted by circular patches, devoid of 



*-$<=' 



Fig. 74. — Achorion Lebertii (Fleming). 



hairs, except a few enlarged broken ones which persist. 

 These patches grow at their margins and so may become 

 confluent ; they are shiny in appearance and covered with 

 glistening scales of epithelium or with a greyish crust. 

 The hairs and epithelial scales of the affected parts contain 

 Achorion Lebertii v. Trichophyton tonsurans. The disease 

 readily yields to improved hygiene, constant cleansing with 

 soap and water, and dressing with tincture of iodine, 



