102 MR. youatt’s veterinary lectures. 
cruel treatment—the constitutional derangement produced by 
the sudden revulsion of blood from the integument to the vital 
parts, or that which must be the consequence of the full seda¬ 
tive of extreme cold, brought suddenly to bear on an animal 
highly excited, and every vessel and every pore dilated; nor, on 
the other hand, when the circulation loiters in the veins, and the 
part is exhausted by cold, the dangerous consequence of the 
blood again violently rushing on, and distending the constricted 
and paralyzed vessels. 
I have now to do only with the Schneiderian membrane,—that 
membrane, indeed, which is first and most exposed to these 
changes and injuries, and which has been previously debilitated 
by other causes. In my last Lecture, I spoke of the mucous 
membrane of the nose as the guard of the lungs ; as arresting 
every deleterious substance, whether gaseous or more material; 
and how much has it to do here ! To what a villanous com¬ 
pound of smells is the stabled horse exposed during the far 
greater part of his time ! Our eyes weep, and temporary coryza 
is established, if we remain in the stable but a few minutes. He 
lives there. All these pungent particles fall on the membrane of 
his nose—they are detained there—they make their full and 
worst impression there : then we cease to wonder that the vita¬ 
lity of the membrane is so much impaired; that inflammation is 
so easily excited, and so difficult to be subdued, and so much 
disposed to spread to neighbouring parts. 
The frequent consequence of coryza in the horse is, as may be 
supposed from what I have said, the establishment of 
NASAL GLEET. 
The previous inflammation may have been slight, or it shall 
have passed altogether away; but there remains an occasional 
and sometimes a profuse discharge. If it is of the natural co¬ 
lour and consistence, and flows with some regularity, it probably 
proceeds from the nostril. If it flows more irregularly, and is 
discharged by fits and starts, and in considerable quantities, it 
proceeds from the cells of the face or head. If it wears the tinge 
of the food, the pharynx is affected, and the tensor muscle of the 
soft palate is relaxed. If it is purulent, it does not follow that 
there is ulceration, for this is the character of a mucous mem¬ 
brane under inflammation ; but if the breath is foetid, and blood 
mingles with the pus, ulceration has been established. This 
gleet will continue sometimes for weeks and months, and bid de¬ 
fiance to all our applications : if it does so, it too frequently de¬ 
generates in, or was from the beginning, another disease, the 
