126 ON THE COAGULATION OF THE BLOOD 
it had been introduced, and so close the orifice of the glass tube with ordinary 
solid matter. In Fig. 6 c the tube is represented pressed down by a weight 
in a vein, V, with blood, B, in the glass portion, while the gutta-percha part closes 
it below. At the same time I performed a comparative experiment, to which 
I would invite particular attention, although I am sorry at this late hour to 
occupy the attention of the Society so long. I tied a thin piece of gutta-percha 
tissue over the lower end of a similar glass tube, and simply poured blood into 
it from the jugular vein of an ox. I wished to compare the condition of blood 
which had been simply poured into a tube, with blood which had been intro- 
duced without any disturbance of its central parts. But in order to make the 
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experiment a fair one, as it might be said that the blood poured from the vein 
had been more exposed to the air than that into which the tube was slipped, 
I proceeded in the following way: I obtained a long vein containing plenty 
of blood, and having first filled the second tube, with the gutta-percha bottom 
(Fig. 6d), by simply pouring blood into it from the vein, I cut off a portion of 
the vein which had been thus emptied, and having tied one end and everted 
the lining membrane of the other end, and having also everted the lining mem- 
brane of the orifice of the remainder of the vessel which was full, I poured the 
blood from the full portion through the air into the empty part. In doing this 
I had difficulty in getting blood enough, and it passed through the air in slow 
drops, and that only when the vein was squeezed by my warm hand. At last, 
having introduced sufficient for the purpose, I slipped down the compound 
tube and bent its gutta-percha portion, as represented in Fig. 6c, and left both 
tubes for a while undisturbed. At the end of three hours and a half I found 
that the blood which had been simply poured in was a mass of clot, and fluid 
