4o 
and although we cannot explain in exact terms the reason of this fact, we 
may mention, in passing, that the nerves ending in the stomach, are branches 
of the sae nerve from which the muscles of the larynx are supplied with 
motor power. We shall see, in treating of asthma and broken-wind, what 
marked influence food has in the causation of these diseases, as well as in 
the complaint now under consideration. One other cause of roaring, is 
confinement in badly-ventilated, close, stuffy stables. 
In cases of roaring which are not very pronounced, the characteristié 
sound is usually not heard unless the animal be made to go at a fair pace, 
Roaring in many cases is at first intermittent, gradually afterwards becoming 
established as the muscles waste more. In such cases, in the first instance, 
the sound is often heard at the beginning of exercise, and passes off as the 
_ work is continued. If the horse be worse at the end of a canter than at 
starting, he may be regarded as a pronounced roarer in all casés, excepting 
in'those where there is some inflammatory action of the throat, in which 
cate it is most likely only a temporary phenomenon. In trying a horse for 
ahi - bis wind, it is customary to place him against a wall and make a feint to 
“Strike him. If he grunts he is further examined ; if not, he is made to cough ~ 
by compressing the throat, and if the cough enforced sounds healthy, he is 
passed. It is, however, best to have the horse galloped, and to let him finish 
his run as he is going uphill. In the case of a draught horse, the animal 
may be made to draw a load at a fair pace up an inclined plane, when, if he 
bea roarer, the characteristic sound will be made. All forms of roaring 
constitute unsoundness, yet, in some cases of recent inflammation of the 
throat or lungs, the animal should again be examined after a reasonable 
interval, before being finally rejected. Some horses, as is well known, are 
apt to make a noise when pulling hard at the bridle, owing to the pushing 
back of the tongue ; but this is easily remedied. 
We will now consider the treatment of roaring. When the complaint 
follows influenza, strangles, or ordinary cold, the animal must be carefully 
treated and attended to. He should have light work only; and a good 
nutritious diet, with not too much dry hay, should be supplied. The throat 
should be smartly blistered with a mixture of equal parts of ointment of 
cantharides and ointment of iodide of_mercury, and a draught containing 
iodide of _potassium one drachm, tincture of nux vi vomica one drachm, liquor _ 
ar rsenicalis. two drachms, and water toa pint, may ‘be given twice daily. In 
those cases of roaring which are dependent upon tumours, the latter should — 
be removed when practicable. iat 
The greatest number of cases of roaring are, as we have said above, 
due to actual waste of the muscles of the larynx, a and these cases are the most 
inveterate. Blisters, or the application of the firing iron, ‘have, however,- 
succeeded in arresting the wasting of the muscles, when applied in the early 
stages to the skin in the region of the throat. Chlorate of potassium in doses 
of one or two drachms is recommended as well worthy of trial for arresting 
this wasting change, and with this view it may be given in the drinking 
water in the confirmed cases twice daily. If preferred, it may be given in doses 
