362 BOVINE PATHOLOGY. 



centre. A number of these aggregated produce a "honey- 

 comb-like mass, whence the disease is known as ^^ Honey- 

 comh Ringworm." It does not originate in the ox, but 

 is transmissible to this animal with some facility. Mice 

 and rats suffer from it, especially the former, for they 

 become much debilitated and their heads covered with 

 crust, in the form of an immense tumour, which causes 

 absorption of the facial bones by pressure. Pulverising 

 of the crust disseminates the spores, whence the disorder 

 is infectious, but certain conditions pf the skin, as seen in 

 young or debilitated aliimals, seem especially favorable to 

 its growth. 



Treatment. — Remove the crusts and destroy them ; thus, 

 an ulcer caused by absorption of the superficial layer of 

 the dermis will be exposed. Eemove all affected hairs 

 and dress with nitrate-of-mercury ointment, nitrate of 

 silver, vinegar of cantharides, or, preferably, dilute sul- 

 phurous acid. Many kinds of animals suffer from this 

 disease, and true f^vus cruets have been grown from 

 spores on the acid cut surface of an apple. 



Tinea tonsurans is caused by another and more simple 

 iungus—Trico^phyton tonsurans. Its constituents are 

 smaller than those of Favus, and it does not project as 

 cups on the surface, simply invading the epidermal struc- 

 tures and constituting a fine powder on the epidermis. 

 It affects young animals, especially when exposed to 

 damp, and with dirty skins, and is readily transmissible 

 from ox to ox, or to man and other animals. It attains 

 a greater luxuriance of growth in the ox than in man, 

 and the disease, when first received by man from the ox. 



L.-TTn^wrse:! 



Fig. 69. — Hair, with the spores of Trichophyton tonsurans. (After Harley 



and Brown.) 



is so luxuriant that it has been described as specifically 

 distinct. 



