or an ulceration of the part may
ensue, either of which is liable to produce a chronic cough. For the
ulceration it is useless to prescribe, because it can neither be
diagnosed nor topically treated by the nonprofessional.

If a chronic cough remains after all the other symptoms have
disappeared, it is advisable to give 1 dram of iodid of potassium
dissolved in a bucketful of drinking water, one hour before feeding,
three times a day for a month if necessary. Also rub in well the
preparation of iodid of mercury (as advised for the swollen glands)
about the throat, from ear to ear, and in the space between the lower
jawbones. The application may be repeated every third day until the part
is blistered.

SPASM OF THE LARYNX.

The symptoms are as follows: Sudden seizure by a violent fit of
coughing; the horse may reel and fall, and after a few minutes recover
and be as well as ever. The treatment recommended is this: Three drams
of bromid of potassium three times a day, dissolved in the drinking
water, or give as a drench in about a half pint of water for a week.
Then give 1 dram of powdered nux vomica (either on the food or shaken
with water as a drench) once a day for a few weeks.

CROUP AND DIPHTHERIA.

Neither of these diseases affects the horse, but these names are
sometimes wrongly applied to severe laryngitis or pharyngitis, or to
forage poisoning, in which the throat is paralyzed and becomes
excessively inflamed and gangrenous.

THICK WIND AND ROARING.

Horses that are affected with chronic disease that causes a loud,
unnatural noise in breathing are said to have thick wind, or to be
roarers. This class does not include those affected with severe sore
throat, as in these cases the breathing is noisy only during the attack
of the acute disease.

Thick wind is caused by an obstruction to the free passage of the air in
some part of the respiratory tract. Nasal polypi, thickening of the
membrane, pharyngeal polypi, deformed bones, paralysis of the wing of
the nostril, etc., are occasional causes. The noisy breathing of horses
after having been idle and put to sudden exertion is not due to any
disease and is only temporary. Very often a nervous, excitable horse
will make a noise for a short time when started off, generally caused by
the cramped position in which the head and neck are forced in order to
hold him back.

Many other causes may occasion temporary, intermittent, or permanent
noisy respirati