the Croonian Lecture. 
191 
rabbit, and the wound in the abdomen being closed, this 
small artery was allowed to bleed into the general cavity. 
In 48 hours the animal was pithed, and the arteries of the 
abdominal viscera were injected by the common minute 
injection coloured by Vermillion. The cavity of the belly 
was then opened ; it was in a perfectly natural state ; there 
were no adhesions of parts ; the small intestines were 
very vascular, and the vessels minutely injected. No 
serum was met with, and no large coagula of blood. One 
very small one was found lying upon the peritonaeum in the 
right iliac region, and adhering to it in parts, but not by the 
whole surface of contact. This coagulum was evidently in- 
jected, and the only one I particularly examined, as there only 
remained one or two smaller coagula lying upon a portion 
of the intestinum ilium. All the rest of the blood that had 
been effused was absorbed. A drawing taken from this coa- 
gulum in the microscope, by Mr. Bauer, is annexed. He 
has shown the small arteries of the peritonaeum entering the 
channels in the coagulum, which are larger than the arteries 
with which this communication has been formed ; their ap- 
pearance is also very different from that of arteries ; they 
seem to have been over distended by the injection, and not 
to have acquired a regular form : there are three or four 
points of communication laterally between the channels in the 
coagulum and the arteries of the peritonaeum, and it would 
appear that there is another communication immediately 
behind the centre of the coagulum. In all of these points, 
the smallness of the arteries, when compared with the chan- 
nels themselves, is equally distinct. Vide Plate XII. 
The appearance this injected coagulum put on, brought to 
