put under the microscope, the natural cells of the cuticle and hair
will be seen to have become transparent, while the groups of spherical
cells and branching filaments of the fungus stand out prominently in the
substance of both, dark and unchanged. The eruption usually appears on
the back, loins, croup, chest, and head. It tends to spontaneous
recovery in a month or two, leaving 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 individually, but in the horse the mere shaving of
the affected part is usually enough. It may then be painted with
tincture of iodin 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: _Achorion schoenleini._ MALADY: _Favus, or honeycomb
ringworm._--Megnin and Goyau, who describe this in the horse, say that
it loses its characteristic honeycomb or cup-shaped appearance, and
forms only a series of closely aggregated, dry, yellowish 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 by acetic acid, alcohol, ether, or oil of
turpentine, while the cells are turned bluish by iodin. For treatment,
remove the hair and apply tincture of iodin or corrosive sublimate
lotion, as advised under the last paragraph.

PARASITE: _Microsporon furfur._ MALADY: _Parasitic pityriasis._--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 2-1/2 ounces is
usually applied to effect a cure.

ANIMAL PARASITES OF THE SKIN.[6]

ACARIASIS, OR MANGE.

This affection is due to the irritation of the skin caused by the
presence of nearly microscopic acari, or mites. The disease vari