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of bloud being weaker, it will be apt to congeal the sooner, so that at the latter end of the work you must draw out the Quill ofter, and clear the passage; if the Dog be faint-hearted, as many are, though some stout fierce Dogs will bleed freely and uninterruptedly, till they are convuls'd and dye. But to prevent this trouble, and make the experiment certain, you must bleed a great Dog into a little one, or a Mastive into a Curr, as I once try'd, and the little Dod bled out at least double the quantity of his own bloud, and left the Mastive dead upon the Table, and after he was untyed, he ran away and shak'd himself, as if he had been only thrown into water. Or else you may get three or four several Dogs prepared in the same manner; and when one begins to fail and leave off bleeding, administer another, and I am confident one Dog will receive all their bloud, (and perhaps more) as long as it runs freely, till they are left almost dead by turns: provided that you let out the bloud proportionably, as you let it goe into the Dog, that is to live.
Thirdly, I suppose the Dog that is to bleed out into dishes will endure it the better, if the Dogs that are to be administred to supply his bloud, be of neer an equal age, and fed alike the day before, that both their blouds may be of a neer strength and temper.
There are many things I have observed upon bleeding Dogs to death, which I have seen since your departure from Oxford, whereof I shall give you a relation hereafter; in the mean time since you were pleased to mention it to the Royal Society, with a promise to give them an account of this experiment, I could not but take the first opportunity to clear you from that obligation, &c.
So far this Letter: the prescriptions whereof having been carefully observ'd by those who were imployed to make the Experiment, have hitherto been attended with good success; and that not only upon Animals of the same Species (as two Dogs first, and then two Sheep) but also upon some of very differing Species as a Sheep and a Dog; the former Emitting, the other Receiving.)
Note only, that in stead of a Quill, a small crooked thin
