450 BUKEAU OF A2JIMAL INDUSTRY. 



substance of both, dark and uncLangod. The eruption usualh^ appears 

 on the back, loins, croup, chest, and head. It tends to spontaneous 

 recovery in a month or two, lea\ing for a time a dappled coat from 

 the spots of short, light-colored hair of the new growth. 



The most effective way of reaching the parasite in the hair follicles 

 is to extract the hairs individual!}-, but in the horse the mere shaving 

 of the affected part is usuall}" enough. It may then be painted with 

 tincture of iodine twice a day for two weeks. Germs about the stable 

 may be covered up or destroyed by a whitewash of freshly burned 

 quicklime, the harness, brushes, etc., may be washed with caustic 

 soda, and then smeared with a solution of corrosive sublimate one-half 

 dram and water 1 pint. The clothing may be boiled and dried. 



Parasite: Acliorion sclionlelni. Malady: Favus^ or Honeycomb 

 ringv:07Tn. — Megnin and Go3'au, who describe this in the horse, say 

 that it loses its characteristic honej^eomb or cup-shaped appearance, 

 and forms onl}^ a series of closely aggregated, dr}^, j^ellowish crusts 

 the size of hemp seed on the trunk, shoulders, flanks, or thighs. 

 They are accompanied by severe itching, especially at night. The 

 cryptogam, formed of spherical cells with a few filaments only, 

 grows in the hair follicles and on the cuticle, and thus a crust often 

 forms around the root of a hair. Like the other cryptogams, their 

 color, as seen under the microscope, is unaffected b}' acetic acid, 

 alcohol, ether, or oil of turpentine, while the cells are turned bluish 

 by iodine. For treatment, remove the hair and apply tincture of 

 iodine or corrosive sublimate lotion, as advised under the last para- 

 graph. 



Parasite: Mlcro^-poron fiirftir. Malady: Parasitic jpitijrimu. — 

 This attacks the horse's head where the harness presses, and leads to 

 dropping of the hair, leaving bald patches covered with a branlike 

 scurf, without any eruption, heat, tenderness, swelling, or rigidity of 

 the skin. A lotion of carbolic acid 1 dram, and water S^- ounces, is 

 usuall}^ applied to effect a cure. 



AN'IMAL parasites OF THE SKIN. 



Acariasis^ or mange. — This affection is due to the irritation of the 

 skin, caused by the presence of a nearly microscopic acarus, or mite. 

 The disease varies, however, according to the species of acarus which 

 infests the skin, so that we must treat of several different kinds of 

 acariasis. 



Parasite: Surcojytes scahiei equi. Malady: Sai'coptic acariasis. — 

 This is the special Sarcoptes of the horse, but under favorable conditions 

 it can be transmitted to ass and mule, and even to man, and may live 

 indefinitely on the human skin. The mite is nearly microscopical, but 

 may be detected with a magnifying lens among moving scurf taken 

 from the infected skin. Like all Saixoptes, it burrows little galleries 



