Tinea Tonsurans. Circinate Ringworm. 23 



treatment directed to the destruction of the cryptogam. On the 

 other hand, the continuance of the disease by reason of neglect 

 during winter, and under insufficient and dry feeding, is often 

 associated with weak or cachectic condition, and when, in the 

 very young especially, the lips become badly affected, prehension 

 may become difficult or impossible, and marasmus may be the 

 result. 



Prevention. This is to be secured mainly by the separation 

 of all affected animals, from other flocks and herds until the para- 

 site has been destroyed. Or by the thorough inunction with oil 

 or lard the spores may be prevented from rising in dust. Much 

 more important is the avoidance of the use of combs, brushes, 

 rubbers, blankets, harness, rubbing posts, cars, ships, etc., by 

 the diseased and healthy in common. These articles may be 

 boiled, steamed or soaked in a solution of mercuric chloride 

 (1:500), iodine, carbolic acid or other germicide. The stables, 

 feeding troughs and other appliances should be thoroughly washed 

 with a similar solution. Experiments have shown that the dry 

 spores will grow freely after an exposure to air and light for 

 eleven months, and the mere disuse of buildings cannot lae trusted 

 to, if of less duration than two years, (Megnin, Duclaux). Men 

 handling the affected animals should be careful to avoid touching 

 any hairy, and above all any abraded portion of their skin before 

 the hands have been well disinfected. 



Treatment. The purely local nature of the disease is a guar- 

 antee of the efficacy of topical treatment provided this can be 

 brought into direct contact with the fungus without too much 

 attendant irritation of the skin. Megnin has had success in 

 young horses by scraping off the crust and adherent hairs, and 

 burying them. The removal of the hairs removes an important 

 field of parasitic growth in the hair bulb and follicle, and with 

 cleanliness and above all with a parasiticide the case will do well. 

 One part of tar and two parts of lard or sweet oil will often suc- 

 ceed. Carbolized glycerine (1:10) acts well. Mercuric chloride 

 1 :3oo of alcohol or proof spirit is excellent. Solutions of cresol, 

 creolin, naphthalin, chloro-naphtholeum, lysol, salicylic acid, or 

 iodine may be used. The preparations of iodine are among the 

 best, and though iodine ointment will often succeed, yet such 

 combinations as contain a solvent for the fatty and sebaceous 



