101 
MR. YOUATT’S LECTURES. 
LECTURE YI. 
[(£§* The former part of this Lecture, on Nasal Polypi, was in¬ 
serted in The Veterinarian for November 1831, under 
the assumed signature T.] 
ON CORYZA AND NASAL GLEET IN THE HORSE. 
By coryza I mean inflammation of, and defluxion from, the 
nasal cavity, or the cells with which it is connected. Catarrh is 
the same affection extending to the fauces. It may be so far 
connected with catarrh as being often the precursor of it; but it is 
a distinct affection, and of no unfrequent occurrence. From ex¬ 
posure to night air or to cold, we feel a partial obstruction in the 
nose, a slight heaviness, a pain in the forehead in the region of the 
frontal sinuses, and an increased defluxion from the nose. This 
is sometimes the forerunner of a more extensive and worse disease, 
but often it goes off with little care, and is scarcely worthy of at¬ 
tention. 
In the Horse .—So in a horse we can easily trace the slight and 
circumscribed affection. From exposure to cold, or from some 
unknown cause, he appears to be a little heavy ; there is a 
slightly increased labour in respiration, a little redness of the nos¬ 
tril, and defluxion from it, and weeping from the eye, but no heat 
of the mouth, and no acceleration of the pulse. We give him a 
warm mash, and all goes off. 
But we have seen that the lining membrane of the nose is an 
exceedingly sensitive one. It is, besides, too much exposed to 
unnatural stimulus, and becomes debilitated and disposed to take 
on inflammation. The extreme changes of temperature under 
the influence of which he suffers, would scarcely be thought cre¬ 
dible. Twenty hours out of four-and-twenty he stands in a 
heated stable, into which not a breath of pure and cool air is ad¬ 
mitted, and then he is suddenly led into an atmosphere thirty or 
forty degrees lower. Nothing can be so injurious as these sud¬ 
den changes. The animal frame may be gradually inured to 
any thing. We may enjoy equal health when the thermometer is 
at ninety in the shade, and when it is almost as low as zero ; but 
these sudden and extreme changes nature cannot bear, and, ap¬ 
plied to an enfeebled part, or an enfeebled constitution, they are 
downright murder. 
I am not now speaking of the general effect of our absurd and 
VOL. V. P 
