[ 3»8 ] 
boured under a phthifs pulmonalis for fome months, 
and at that time complained of a pain in his fide. 
The blood, though it came out in a fmall ftream, 
yet flowed with fuch velocity, that it foon filled 
the bafon. After tying up his arm, I attended to the 
blood, and obferved that the furface became tranf- 
parent, and that the tranfparency gradually extended 
deeper and deeper, the blood being ftill fluid. That 
the coagulation firft began on the furface, where it was 
in contact with the air, and formed a thin pellicle ; 
this I removed, and obferved it was foon fucceeded by 
a fecond. I then took up a part of the clear liquor 
with a wet tea-fpoon, and put it into a phial with an 
equal quantity of water j a fecond portion I kept in the 
tea-fpoon i and I found afterwards that they both 
jellied or coagulated, as did the furface of the craffa- 
mentum , making a thick cruft. On prefling with my 
finger that portion which was in the tea-fpoon, I 
found it contained a little ferum. 
From this experiment it is evident, that the fub- 
ftance which formed the fize was fluid after it was 
taken from the vein, and coagulated when expofed 
to the air $ and as this is a property of the coagulable 
lymph alone, and not of the ferum , there can be no 
doubt that the cruft was formed of the former, and 
not of the latter. 
The following experiment, made on the blood, 
without expofingit to the air,likewife proves the fame 
Ex- 
