l^ipeof Silver or Brafs, fo flender that the one end may enter 
into a Quill, and having at the, other end^ that is to enter 
into the Vein and Artene, a loaal! knob, for the better faften- 
ing them to it with a thread, will be much fitter than a ftrait 
Pipe or Quill, for this Operation : for fo they are much more 
eafic to be managed; 
*Tis intended, that thefe tryals fliall be profecuted to the 
urmoft variety the lubje£t wiU>ear As by exchanging the 
bloudof Oldand Young, Sick and Healthy^ Hot and Cold, 
Fierce and Fearful, Lame and Wild Animals, 5cc. and, that 
not only of the fame, but alfo of differing kinds. For which 
end, and to improve this noble Experiment, either for know. 
ledge,or ufe,or both,fome Ingenious men have already propo- 
fed confiderable tryals and Inquiries ; of which perhaps an ac« 
count will be given hereafter. For the prcfent we fliall only 
fubjoyn fome 
Conpderattons about this hind of Experiments. 
It may be confider'd in them, that the bloud of the Emit- 
tent Animal, may after a few minucs of time, by its circula- 
tion, mix and run out with that of iht Recipient. Wherefore 
to be affured in thefe Tryals, that all the bloud of iht Recipi- 
ent is run out, and none left in him but the adventitious 
bloud of the Emittent^ two or three or more Animals (which 
was alfo hinted in the method above ) may be prepared and ad- 
miniftred, to bleed them all out into one* 
It feems not irrational to guefs afore hand, that the ex* 
change of bloud will not alter the nature or difpofirion of the 
Animals, upon which it fliall be praftifed i though it may be 
thought worth while for fatisfaftion and certainty, to deter- 
mine that point by Experiments* The cafe of exchanging the 
bloud of Animals feems not like that of Graffing^ where the 
Cyons turns the Sap of the St6c\^ graffed upon, into its nature i 
the Fibres of the Cyons fo flraining the juice, which pafTes 
from the flem to it, as thereby to change it into that of the 
Cyons, whereas in this transfuflon there feems to benofuchi 
Per« 
\ 
