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MR. YOUATT’S VETERINARY LECTURES, 
DELIVERED AT THE UNIVERSITY OF LONDON. 
LECTURE XII. 
Ozena in the Horse—Worms in the Nostril of the Horse—Ozena 
and Coryza in Cattle and Sheep. 
Ozena is ulceration of the Schneiderian membrane, not always, 
or often, visible, hut recognized by the discharge of muco-puru- 
lent matter, and from the peculiar foetor from which the disease 
derives its name. It resembles glanders in being confined in 
most instances to one nostril, and the submaxillary gland on the 
same side being enlarged; but differs from it, in the gland not 
being adherent, and the discharge from its earliest stage being- 
purulent and stinking. 
How distinguished from other Diseases. —There is sometimes 
a foetid discharge from the nostril in consequence of inflammation 
of the lungs, or produced by some of the sequelae of pneumonia. 
When, after rapid congestion, there has been a breaking down 
of the substance of the lungs, and mortification has seemed to 
have commenced during the life of the animal, and also when 
vomicae have burst, there has been a considerable discharge of 
purulent matter, distinguished, however, from ozena by its usually 
flowing irregularly, and being coughed up in great quantities, 
and more decidedly purulent, and the gland or glands seldom 
affected. The discharge from ozena is constant, /m/co-purulent, 
and attended by enlargement of the glands. It is of immense 
consequence that we should be enabled to distinguish the one 
from the other; for while ozena may sometimes, at least, be 
manageable, the other is the invariable precursor of death. 
Cause. —The cause of ozena cannot always be discovered. 
Chronic inflammation of the membrane may assume another and 
a malignant character. In severe catarrh the membrane may 
become abraded, and the abrasions may degenerate into foul and 
foetid ulcers. It is not an unfrequent consequence of epidemic 
catarrh. It has been produced by caustic applications to the 
lining membrane of the nose. It has followed haemorrhage, 
spontaneous, or as the consequence of injury. I had a horse, 
not many months ago, sadly ill with epidemic catarrh; the sore¬ 
ness of his throat almost precluded the possibility of balling, 
and in the administration of a drench, he struggled and snorted, 
and began to bleed profusely from the nose, and, three days 
afterwards, the smell from that nostril was in the highest degree 
offensive. 
