Tinea Favosa. Favus. Honeycomb Ringworm. 27 



however, continues to mark out more or less perfectly the indi- 

 vidual crusts. The cupping is less marked around the root of 

 the claw, yet the irregular crust exhibits all the microscopic 

 characters of the favus crust, (St. Cyr. ) . On the affected parts 

 the hairs have lost their luster, they stand erect and are easily 

 detached. If the crust is carefully scraped off, the skin in the 

 centre is depressed, smooth, moist, pale or red, while around the 

 margin it is red and swollen, (St. Cyr). There is usually that 

 heavy odor which in all animals attends on favus and which has 

 been likened to the odor of mice or cats urine. 



Dog. In the dog there is the same tendency to invasion of the 

 paws, the lips, face and, in young puppies, the umbilicus. The 

 crusts are more or less distinctly cupped, and though grayish 

 white on the surface, they are sulphur yellow in the deeper layers, 

 and covering a more or less congested derma. When a number 

 have become confluent, the cupping becomes less distinct and the 

 crusts may assume a slaty hue. Itching, which is mostly absent 

 in cats, may be quite intense in the dog. 



Horse. The essential appearance of the crust is like that seen 

 in other animals. Friedberger and Frohner speak of the crusts 

 gathering in bands as wide as the finger. 



Rabbit. On rabbits the paws and head are mostly affected, 

 but it may extend to the body. The crusts varied in size from a 

 pin's head to half an inch in diameter, and were flattened, or, in 

 Megnin's cases, rounded and dry, the spores falling like those of 

 a puff ball (lycoperdoid favus). Only young rabbits up to three 

 months old were affected, those of four months and upward 

 proving re-sistant. 



Prognosis. In the larger and mature animals the disease 

 tends to spontaneous recovery, especially when turned out to 

 pasture in spring and at the time of moulting. Even when more 

 inveterate it usually responds satisfactorily to treatment. On the 

 young and especially on animals of small size (cats, rabbits, 

 birds), it is liable to prove troublesome, extending to wide areas 

 of the skin, interfering with sucking and inducing emaciation, de- 

 bility and death. 



Treatment. This is more satisfactory than in man, probably 

 as claimed by Neumann, because of the relative delicacy of the 

 skin and hairs of the domestic carnivora. At the root of the 



