Page:Philosophical Transactions - Volume 001.djvu/370

 till the other Dog begin to cry, and faint, and fall into Convulsions, and at last dye by his side.

Then take out both the Quills out of the Dogs Jugular Vein, and tye the running knot fast, and cut, the Vein asunder, (which you may doe without any harm to the Dog, one Jugular Vein being sufficient to convey all the bloud from the Head and upper parts, by reason of a large Anastomosis, whereby both the Jugular Veins meet about the Larynx.) This done, sow up the skin and dis-miss him, and the Dog will leap from the Table and shake himself; and run away, as if nothing ailed him.

And this I have tryed several times, before several in the Universities, but never yet upon more than one Dog at a time, for want of leisure, and convenient supplyes of several Dogs at once. But when I return, I doubt not but to give you a fuller account, not only by bleeding several Dogs into one, but several other creatures into one another, as you did propose to me, before you left Oxford; which will be very easie to perform; and will afford many pleasant and perhaps not unuseful Experiments.

But because there are many Circumstances necessary to be observ'd in the performing of this experiment, and that you may better direct any one to doe it, without any danger of killing the other Dog, that is to receive the others bloud, I will mention two or three.

First, that you fasten the Dogs at such a convenient distance, that the Vein nor Artery be not stretched; for then, being contracted, they will not admit or convey so much bloud.

Secondly, that you constantly observe the Pulse beyond the Quill in the Dogs Jugular Vein (which it acquires from the impulse of the Arterious bloud:) For if that fails, then 'tis a sign the Quill is stopt by some congealed bloud, so that you must draw out the Arterial Quill from the other, and with a Probe open the passage again in both of them, that the bloud may have its free course again. For, this must be expected, when the Dog, that bleeds into the other, hath lost much bloud, his heart will beat very faintly, and then the impulse Rh