Page:Philosophical Transactions - Volume 002.djvu/157

 the Carotid Artery in at young Sheep, we inserted a Silver-Pipe into the Quills to let the Blood run through it into a Porringer, and in the space of almost a minute, about 12 ounces of the Sheeps bloud ran through the Pipe into the Porringer; which was somewhat to direct us in the quantity of Bloud now to be transfus'd into the Man. Which done, when we came to prepare the Vein in the Man's Arm, the Vein seem'd too small for that Pipe, which we intended to insert into it; so that we imployed another, about one third part less, at the little end. Then we made an incision in the Vein, after the method formerly publisht, Numb. 28; which method we observ'd without any other alteration, but in the shape of one of our Pipes; which we found more convenient for our purpose. And, having open'd the Vein in the Man's Arm, with as much ease as in the common way of Venæ-seetion, we let thence run out 6 or 7 ounces of Blood. Then we planted our silver Pipe into the said Incision, and inserted Quills between the two Pipes already advanced in the two subjects, to convey the Arterial bloud from the Sheep into the Vein of the Man. But this Blood was near a minute, before it had past through the Pipes and Quills into the Arm; and then it ran freely into the Man's Vein for the space of 2 minutes at least; so that we could feel a Pulse in the said Vein just beyond the end of the silver Pipe; though the Patient said, he did not feel the Blood hot, (as we reported of the subject in the French Experiment) which may very well be imputed to the length of the Pipes, through which the blood passed, losing thereby so much of its heat, as to come in a temper very agreeable to Venal Blood. And as to the quantity of Blood receiv'd into the Man's Vein, we judge, there was about 9 or 10 ounces: For, allowing this Pipe ⅓ less than that, through which 12 ounces pass'd in one minute before, we may very well suppose, it might in 2 minutes convey as much blood into the Vein, as the other did in the Porringer in one minute; granting withall, that the Blood did not run so vigorously the second minute, as it did the first, nor the third, as the second, &c. But, that the Blood did run all the time of those two minutes, we conclude from thence; First, because we felt a Pulse during that time. Secondly, because when upon the Man's saying, He