new
brood that may have been hatched in the interval. All harness and stable
utensils should be similarly treated; blankets and rubbers may be
boiled, and the stalls should be covered with a whitewash of quicklime,
containing one-fourth pound of chlorid of lime to the gallon.

When there are too many animals to treat by means of hand dressings, the
lime-and-sulphur dip or the tobacco dip may be used and are very
effective, though the cresol dips are fairly effective. These dips may
be purchased and made up in the dilution called for on the container.
The affected animals may be dipped when the number warrants it and
facilities are available; otherwise the dips may be applied with a swab
or a spray pump. Directions for constructing a dipping vat may be
obtained from the United States Department of Agriculture on
application. Any treatment used should be repeated in the course of 10
to 14 days. If the stables are not disinfected, animals should be
removed after treatment and put in clean stables or on clean pasture for
at least a month to allow the mites in the infested stables to die.
Otherwise the disease may recur.

PARASITE: _Psoroptes equi_ (_Dermatocoptes equi_,
_Dermatodectes equi_). MALADY: _Psoroptic
acariasis._--Psoroptic mange is less common than sarcoptic
mange in horses, and as the parasite (Pl. XXXIX, fig. 3) only
bites the surface and lives among the crusts under the shelter of the
hair, it is very easily discovered. It reproduces itself with equal
rapidity and causes similar symptoms to those produced by the
_Sarcoptes_. The same treatment will suffice and is more promptly
effectual. The purifying of the stable must be more thorough, as the
_Psoroptes_ will survive twenty to thirty days in the moist atmosphere
of a stable, and may even revive after six or eight weeks when subjected
to moist warmth. Infested pastures will therefore prove dangerous to
horses for that length of time, and, with rubbing posts, etc, should not
be used.

PARASITE: _Chorioptes equi_ (_Symbiotes equi_, _Dermatophagus equi_,
_Chorioptes spathiferus_). MALADY: _Foot mange._--The acarus (Pl. XXXIX,
fig. 2) attacks the heels and lower parts of the legs, especially the
hind ones, and may be present for years without extending upon the body.
Like the _Psoroptes_; it lives on the surface, on the hairs, and among
the scabs. It gives rise to great itching, stamping, rubbing of the one
leg with the other, and the formation of papules, wo