the action of the nostrils. It is a
habit and not an unsoundness. Contrary to roaring, when the animal is
put to severe exertion the sound ceases. An animal that emits this sound
is called a "high blower." Some horses have naturally very narrow nasal
openings, and they may emit sounds louder than usual in their breathing
when exercised.

_Whistling_ is only one of the variations of the sound emitted by a
horse called a "roarer," and therefore needs no further notice, except
to remind the reader that a whistling sound may be produced during an
attack of severe sore throat or inflammation of the larynx, which passes
away with the disease that causes it.

CHRONIC BRONCHITIS.

This may be due to the same causes as acute bronchitis or it may follow
the latter disease. An attack of the chronic form is liable to be
converted into acute bronchitis by a very slight cause. This chronic
affection in most instances is associated with thickening of the walls
of the tubes. Its course is slower, it is less severe, and is not
accompanied with so much fever as the acute form. If the animal is
exerted, the breathing becomes quickened and he soon shows signs of
exhaustion. In many instances the animal keeps up strength and
appearances moderately well, but in other cases the appetite is lost,
flesh gradually disappears, and he becomes emaciated and debilitated. It
is accompanied with a persistent cough, which in some cases is husky,
smothered, or muffled, while in others it is hard and clear. A whitish
matter, which may be curdled, is discharged from the nose. If the ear is
placed against the chest behind the shoulder blade, the rattle of the
air passing through the mucus can be heard within.

_Treatment._--Rest is necessary, as even under the most favorable
circumstances a cure is difficult to effect. The animal can not stand
exertion and should not be compelled to undergo it. It should have much
the same general care and medical treatment prescribed for the acute
form. Arsenious acid in tonic doses (3 to 7 grains) three times daily
may be given. As arsenic is irritant, it must be mixed with a
considerable bulk of moist feed and never given alone. Arsenic may be
given in the form of Fowler's solution, 1 ounce three times daily in the
drinking water. An application of mustard applied to the breast is a
beneficial adjunct. The diet should be the most nourishing. Bulky feed
should not be given. Linseed mashes, scalded oats, and, if in