24 
M. L. TRASliOT. 
Bronchitis, less common, is, on the contrary, more serious ; 
first, on account of its longer duration, of the debility it produces, 
and also of some consequences that may follow. 
When it lasts long, it sometimes gives rise to pulmonary em¬ 
physema. By the repeated efforts of coughing, a certain number 
of pulmonary lobules are torn, and the air escapes into the inter¬ 
lobular connective tissue. 
It is also often followed by chronic roaring. I have observed 
several cases of it. This frequent complication induced me to 
look into its cause, and I believe I have found it. 
In 1853, and later, in 1864, M. Goubaux made it known as 
one of the constant lesions of chronic roaring, the astrophy of 
the laryngeal muscles on the left side. After numerous re¬ 
searches he failed to meet an exception to that rule. lie always 
found those muscles and the nerves which distribute in them in 
an advanced stage of atrophy. And then in 1868 he explained 
this phenomenon as follows : “ The left inferior laryngeal nerve 
passes on the anterior face of the trachea, while the right is 
situated more deeply; therefore, in animals which in harness 
carry a too narrow collar, there must be a constant pressure on 
the left nerve, and as a consequence its paralysis can be ex¬ 
plained.” 
Some days after this, Gunther, Jr., in a letter to Mr. Boule} 7 ', 
stated that since 1834 his father had published in a paper on 
causes of roaring, 1st, that the section of the inferior laryngeal 
produced roaring immediately ; 2d, that 95 times in 100 the 
muscular atrophy existed on the left side of the larynx; he 
objected to the theory of Goubaux in saying that a great number 
of saddle-horses became roarers though they never had a collar ; 
and expressed the supposition that the atrophy of the left recur¬ 
rent might be due to a rheumatic influence. 
The theory of Goubaux seemed to be satisfactory, and be¬ 
came the object of a revindication for priority. Mr. Colin 
claimed it also. However, it was accepted. Two anatomists 
and physiologists gave it their approbation. Mr. Colin added 
that the atrophy of the nerve might be due to its relations 
with the bronchial ganglions. I)upny had mentioned this fact also. 
