46 
DEFORMITY OF THE 
to the dilatation of every cell or interstice, all of which were perfectly empty.” 
“ This horse’s case may apply to hundreds. In aU probability this permanent 
unsoundness was the sequela either of severe catarrh or strangles.” 
Science is indebted to Mr. Turner for the development of this 
new fact; but I cannot myself regard it otherwise than as an oc¬ 
casional—not a common—cause of the disorder. 
Professor SeweU met with a case of roaring, in which he found an exos¬ 
tosis growing from the cervical vertebrae, between the two first ribs, and 
pressing against the windpipe. The French authors present us with accounts 
of polypi in the nostrils; a piece of ribbon in the chamber of the nose ; a 
molar tooth displaced, and thrust into the same situation, producing roaring; 
but for my own part I never met with any cases of the sort. 
Pulmonary Compression. —Hurtrel d’Arboval includes both 
pleurisy and peripneumony among the causes of roaring. 
A question has arisen, whether or not we are warranted in re¬ 
garding the lungs as the seat of roaring. The subject being one 
on which individual experience is necessarily contracted, it is only 
by an appeal to practitioners at large that such a question can 
be satisfactorily answered. In my own mind theory would seem 
to reply in the negative: the following case, however, makes me 
stagger in this opinion. The case occurred to my late much 
respected father. 
A horse was treated for violent roaring. The neck was repeatedly blistered; 
it was even fired; but no relief was obtained. So painful was it to hear the 
animal roar, when he was even gently led out of the stable, that broncho- 
tomy was had recourse to, but without avail. At length, seeing the animal 
continued to suffer so much pain and distress in breathing, and that the case 
appeared altogether insusceptible of being relieved, it was determined to de¬ 
stroy him. On examination, no thickening of the laryngeal or tracheal mem¬ 
brane appeared, nor, in fact, any other disease of those parts. But the lungs 
were hepatized throughout their substance, and the smaller divisions of the 
bronchial tubes in many places so compressed that they were hardly pervious. 
From the circumstance of the operation of bronchotomy not 
having any effect in this case, it is obvious enough the cause 
must have existed within the bronchial tubes: there cannot, there¬ 
fore, remain any further question about the seat of roaring occa¬ 
sionally being the lungs. In confirmation of this stands the 
testimony of Mr. James Turner, who says, I have occasionally 
ridden some roarers, in which I have been perfectly convinced 
that the noise issued from obstructed bronchi within the lungs 
themselves.” 
Nervous Influence. —In the year 1826, M. Dupuy published, 
in the Recueil de Medicine Veterinaire, an account of some ex¬ 
tremely interesting experiments on this subject. He found that 
either compression or division of the eighth pair of nerves had the 
effect of producing roaring; and the rational explanation he gave 
of the phenomenon was, that as the inferior laryngeal nerves which 
