230 
FIFTH REPORT — 1835 . 
surface, I did not discover any spot in 'which abrasion had taken place. 
Almost every part on the intestinal canal of this dog exhibited more or 
less injection of a bright colour. In the higher portions the redness oc¬ 
cupied nearly the whole surface, but lower down it strikingly marked 
the summits of the rugse. The mucous glands towards the termination 
of the rectum were considerably enlarged. The contents of the intes¬ 
tinal canal were examined by G. O. Rees, but no trace of arsenic could 
be detected even in the small intestines*. 
No. 4. This illustration I take from the case of a horse which received 
2-j ounces of arsenic rolled up in dry paper. In four hours the effect of 
the poison was strongly shown ; and in the evening, ten hours from the 
time at which it was given, the animal died. The stomach was examined 
the following morning. It was distended with masticated hay, mixed 
with a moderate quantity of fluid. A considerable quantity of the 
arsenic in substance was found about the greater curvature rather more 
than one third from the pylorus, and consequently applied to the second 
and third portions of the mucous membrane. Traces of the arsenic 
were evident in many other parts of the stomach, although it was no¬ 
where collected in substance as at the spot just mentioned. The greater 
portion of the mucous surface of the middle third was covered with a 
tenacious layer of secretion intermediate between lymph and mucus. It 
was nearly white when applied to the stomach, but the other surface was 
discoloured as well as roughened by the intermixed and adherent parti¬ 
cles of food. The mucous membrane beneath this layer was deeply 
coloured with blood in those parts with which the arsenic appeared to 
have been in contact, whilst over a large surface in which this was not 
the case, the membrane, though not white, did not seem to be morbidly 
coloured. The summits of the rugEe and other prominent portions of 
the mucous surface, both in the third portion of the stomach and in the 
pylorus, were especially reddened. This was the case with the orifices 
of the biliary and pancreatic ducts. That portion of the stomach which 
is covered with a strong cuticular lining did not appear to be at all af¬ 
fected. Most of the bots, of which there were several in this stomach, 
were still alive. There was some redness in the course of the alimentary 
canal, but it was neither intense nor otherwise remarkable. The con¬ 
tents of these intestines were very carefully examined, but no arsenic 
was discovered. 
No. 5. A second horse received a portion of arsenic in the same man¬ 
ner as the preceding, except that instead of being allowed to die he was 
killed in four hours, before he had betrayed any symptom of derange¬ 
ment from the dose which he had taken. The stomach was soon after 
examined. It contained about the same quantity of food as in the for¬ 
mer case, and the arsenic in substance was found collected in precisely 
the same part of the. stomach. A considerable portion, however, had 
also passed the pylorus. The appearances observed in this case were 
very similar to those observed in the preceding instance, but they were 
much less intense. The same kind of tenacious layer covered the greater 
* Wax models by Joseph Towne illustrated this and the following cases. 
