TRANSLATIONS FROM FOREIGN PAPERS. 
25 
Still, from the day when Goubanx had called the attention 
to that lesion proper to chronic roaring, I examined the larynx 
of all the roarers which died in my service. I never failed to meet 
the same lesions. 
But later, having heard that saddle-horses were commonly 
affected, though they never had a collar on their neck, and also 
that it was commonly seen after an attack of bronchitis compli¬ 
cation of gourrne, I came to the conclusion that there must 
exist, in many cases at least, another mechanism for its develop¬ 
ment. 
I first remarked that in all the anatomical researches I made 
the inferior laryngeal nerve was not only atrophied from 
the base of the neck at a point where it would have been com¬ 
pressed by the collar, but in its wdiole length from its origin. 
Again I observed, as indicated by Colin and as described by 
Chauveau and Arloing, that the left laryngeal leaves the pneumo- 
gastric farther back than the right, on a level with the roots of 
the lungs, and then twists round behind the cross of the aorta. 
There it is interposed between this vessel and the large gang¬ 
lionar mass of the bronchia, which may compress it against the 
artery. 
And again, I observed in many post-mortems of roarers that 
this nerve, surrounded by the ganglions indurated or trans¬ 
formed by any kind of neoplasm, was precisely atrophied from 
this point, and was reduced from there to the condition of a thin, 
greyish thread up to its end. I have preserved one piece amongst 
many, illustrating this condition. 
I was then brought to the conclusion that the pressure of the 
bronchial ganglions had a great influence on the production of 
roaring ; was, perhaps, the exclusive cause of the atrophy and of 
the left laryngeal muscles. 
It is thus that I explained to myself the frequent persistency 
of roaring after bronchitis of gourrne, as it is known that all the in¬ 
flammatory complications of gourrne are accompanied more so than 
the simple inflammation, by large swellings of the lymphatic 
ganglions. Externally they generally suppurate, but when deep 
they seldom undergo - this change, in such a way that after four 
