m domestic animals, and is chiefly responsible
for body-ringworm, and for suppurative ringworm, whether upon the
bearded region or elsewhere.

#What is the pathology of ringworm?#

On the general surface the fungus has its seat in the epidermis,
especially in the corneous layer; upon the scalp and bearded region the
epidermis, hair-shaft, root and follicle are invaded. The inflammatory
action may vary considerably in different cases, and at different times
in the same case.

The fungus consists of mycelium and spores. In the epidermic scrapings
it is never to be found in abundance, and the mycelium predominates,
while in affected hairs the spores and chains of spores are almost
exclusively seen, and are usually present in great profusion.

#How do you examine for the fungus?#

The scrapings or hair should be moistened with liquor potassae, and
examined with a power from three hundred diameters upward.

#How is ringworm of the general surface to be distinguished from eczema,
psoriasis and seborrh[oe]a?#

By the growth and characters of the patch, the slight scaliness, the
tendency to disappear in the centre, by the history, and, if necessary,
by a microscopic examination of the scales.

#How is ringworm of the scalp to be distinguished from alopecia areata,
favus, eczema, seborrh[oe]a, and psoriasis?#

By the peculiar clinical features of ringworm on this region--the slight
scaliness, broken hair and hair stumps, with a certain amount of
baldness--and in doubtful cases by a microscopical examination of the
hairs.

In favus, although the same condition of the hair is noted, the yellow,
cup-shaped crusts, and the presence of the atrophic areas in that
disease are pathognomonic.

#How is ringworm of the bearded region to be distinguished from eczema
and sycosis?#

By the peculiar lumpiness of the parts, the brittleness of the hair,
more or less hair loss, and the history.

The superficial type of ringworm sycosis--those cases in which the
disease remains a surface disease--is readily distinguished, as the
symptoms are essentially the same as ringworm of non-hairy parts, except
that some of the hairs in the areas may become invaded and break off or
fall out.

In doubtful cases recourse may be had to microscopical examination.

#What is the prognosis of ringworm of these several parts?#

When upon the general surface, the disease usually responds rapidly to
therapeutical applications; upon the