390 Sir Everard Home’s additions to 
putrefaction, after having stood six hours, it was’ divided into 
slices half an inch thick. Forty-eight hours after it had been 
injected, I examined it with Mr. Bauer, and found its internal 
substance very minutely injected, there being only two small 
bursts of extravasation, each the size of a pea. Mr. Bauer's 
drawings of the appearance the injection put on immediately 
under the surface of the coagulum, and upon the cut edge of 
one of the sections, are annexed, and require little description, 
so perfectly do they represent the objects from which they 
were taken. I was assisted in this and the other experiments 
by Mr. Clift and Mr. Gatcombe. This experiment de- 
cides the question respecting the structure of the net-work ; 
since now the channels are filled with injection, their shape, 
size, and mode of ramification admit of every one examining 
them for himself ; and one of the slices of the coagulum, 
in which this structure is seen, I have been able to pre- 
serve in spirit, and two others in oil of turpentine, so that 
the originals, as well as the drawings, are bfought before 
the Society.* As the injection could only fill the spaces from 
which the carbonic acid gas was extracted, it cannot be 
doubted that the channels were formed by the gas. 
Having brought these facts in proof of channels being 
formed in coagulated blood out of the body, and of their 
depending upon the evolvement of the carbonic acid gas 
contained in the blood, it next became necessary to ascertain 
whether coagula of blood deposited in the abdomen under- 
went the same change. To determine this point, I wounded 
one of the smaller branches of the mesenteric artery of a 
* These specimens, two of injected coagula of venal blood, and one of arterial 
blood, are deposited in the Collection of the Royal College of Surgeons in Lin* 
coln’s-Inn-Fields. 
