434 
CONTRIBUTIONS TO THE PATHOLOGY AND 
to the whole length of the tube. By the first of these conditions 
we learn that the obstruction existed either in the larynx or the 
trachea; and by the second condition, that, most probably, it 
existed in both : that it was in both, was proved by the facts 
discovered when the animal was dissected; and, now that we 
know this, the explanation of the entire phenomena may appear 
simple : but it must be borne in mind, that the simplicity of the 
explanation is only made apparent by the discovery of the cause 
from the facts brought to light after the animal’s death. Most 
phenomena become simple when all the conditions of their pro- 
duction are once understood ; it is the getting of this knowledge 
of conditions wherein the difficulty lies. Had I known the con- 
ditions which produced the phenomena in the present instance, 
the result, most certainly, would have been otherwise. If the 
reader has in his possession The VETERINARIAN for 1813, let him 
turn to page 68 of that volume, and he will find a most interesting 
case, very similar in many respects to the present: it is given by 
Professor Dick, and will amply repay the trouble of perusing it. 
It is the only one of the kind, I believe, recorded for the last ten 
years ; and it is the only one which the Professor had ever met 
with in his own practice up to the date of its publication. 
The next in rotation is Case III, which 1 have entitled 
“ Haemorrhage of the Liver it presents many features of great 
interest to the veterinary pathologist. The liver, in this case, was 
in a very peculiar condition : it was not ruptured, but simply 
appeared as though the parenchyma of the organ had been first 
removed by absorption, and, in consequence, blood had become 
slowly and equally effused amongst its loosened lobules. The 
mode by which such a change would occur we can readily perceive. 
The lungs were diseased, great portions of their substance being, 
in fact, solid, and impervious alike to blood and air ; from which 
state a ready solution is afforded to the change in the structures of 
both the liver and the heart. 
Professor Dick states, that permanent disease of the lungs 
speedily gives rise to organic disease of the liver, a fact which 
experience amply testifies : the intimate functional relation which 
exists between these important organs proves that it cannot long be 
otherwise. A portion of the lungs being solid, the respiration 
would, of course, become accelerated ; hence the cause, in this 
instance, of the broken wind ; while the liver, not being able to rid 
itself of the blood which it contained so readily as heretofore, con- 
gestion of the organ ensued, which, being permanent, produced 
softening and absorption of its parenchyma, and, in the end, he- 
morrhage amongst its loosened structures. 
Hemorrhage of the liver, of a character resembling the present 
case, is, 1 believe, a matter of very rare occurrence : it happens oc- 
