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Pipe of Silver or Brass, so slender that the one end may enter into a Quill, and having at the other end, that is to enter into the Vein and Artery, a small knob, for the better fastening them to it with a thread, will be much fitter than a strait Pipe or Quill, for this Operation: for so they are much more easie to be managed.
'Tis intended, that these tryals shall be prosecuted to the utmost variety the subject will beare: As by exchanging the bloud of Old and Young, Sick and Healthy, Hot and Cold, Fierce and Fearful, Lame and Wild Animals, &c. and that not only of the same, but also of differing kinds. For which end, and to improve this noble Experiment, either for knowledge, or use, or both, some Ingenious men have already proposed considerable tryals and inquiries; of which perhaps an account will be given hereafter. For the present we shall only subjoyn some
Considerations about this kind of Experiments.
1. It may be consider'd in them, that the bloud of the Emittent Animal, may after a few minutes of time, by its circulation, mix and run out with that of the Recipient. Wherefore to be assured in these Tryals, that all the bloud of the Recipient is run out, and none left in him but the adventitious bloud of the Emittent, two or three or more animals (which was also hinted in the method above) may be prepared and administred, to bleed them all out into one.
2. It seems not irrational to guess afore-hand, that the exchange of bloud will not alter the nature or disposition of the Animals, upon which it shall be practised; though it may be thought worth while for satisfaction and certainty, to determine that point by Experiments. The case of exchanging the bloud of Animals seems not like that of Graffing, where the Cyons turns the Sap of the Stock, graffed upon, into its nature; the Fibres of the Cyons so straining the juice, which passes from the stem to it, as thereby to change it into that of the Cyons, whereas in this transfusion there seems to be no such
