[ 38 o ] 
From thefe confiderations, I communicated my 
thoughts upon this fubjedt to fome of my brethren, 
wiihing to have experiments made upon brutes, that 
might afeertain as far as poffible, by analogy, a matter 
which appeared to us of great importance ; and this mo- 
tive induced one of them, with the affi fiance of a perfon 
of fuperior knowledge in the anatomy and dileafes of 
horfes, to refolve upon diffe6ling out of the thighs of a 
horfe and a dog, the firfl opportunity that offered, the 
trunk of the artery to the length of two or three inches ; 
to obferve whether there was fuch a divifion of it, as I 
have remarked in the human fpecies ; and then to treat 
the wound as after the operation for an aneuryfm, at- 
tending particularly to all the confequences. This kind 
of lufus naturae has been often found in the humerus^ by 
anatomiffs. After having engaged my friends at Nor- 
wich in this purfuit, fomething happening to prevent 
their carrying the delign into execution fo foon as they 
intended, determined me, with the affiffance of Mr. re- 
vans, whom I have mentioned before, to make the ex- 
periment upon a full-grown young fpaniel, and to keep 
a journal of the occurrences in confequence thereof. 
On January the 19th, 1775, we performed the ope- 
ration with very little trouble, having fecurely bound the 
animal to prevent interruption. We defignedly includ- 
ed in the ligatures, with the trunk of the artery, a lit- 
tle above the middle of the thigh, the vein and nerve ac- 
companying it, in order to render the experiment more 
decifive, 
