THE 
VETERINARIAN. 
VOL. XII, No. 135.] MARCH 1839. [New Series, No. 75. 
COMPARATIVE ANATOMY AND PATHOLOGY. 
By Mr. YOU ATT. 
[At the request of several correspondents, these Lectures are resumed ; 
but they shall at all times give way to better matter. — Y.] 
LECTURE XXIII. 
The first or Olfactory Nerves — their origin — course — structure — 
union — bulk in herbivorous Animals — in carnivorous ones, and 
in different species of the Carnivora. In Birds — the question 
as to the sense of smell in Birds. In Fishes — its exit from the 
cranium. The Ethmoid Bone in the Horse — in different Animals. 
FROM the moment that I yielded to the solicitation of some 
valued pupils, who had been privately instructed with regard to 
the nervous system of our patients, and commenced these public 
lectures with the respiratory system, L have felt occasional and very 
considerable inconvenience, and have been too often compelled to 
solicit the indulgence of my readers on account of unavoidable re- 
petition. The nasal membrane, and the nerve which ramified upon 
it, could not be passed in silence while we were illustrating that 
system, because the former lined one of the most important divi- 
sions of the respiratory canal, and the functions of the latter were 
considerably affected by the lesions and diseases of that membrane. 
After this lecture, however, we shall rarely tread on ground which 
has already been occupied ; and, should these Lectures ever appear 
in another form, we shall know how to remedy the evil. 
The Organic Nerves ■ — those connected with respiration, circu- 
lation, digestion, secretion, and, in fact, life itself — have been fully 
considered. Of the Animal Nerves — the third, fourth, and sixth, 
conveying the volitions of the mind to the eye, and the twelfth, to 
the tongue — the seventh, the old portio mollis of the seventh ; a 
partly voluntary and partly involuntary nerve, and discharging, as 
the case might happen to require, the functions of organic and animal 
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