f (499) 
•Und the fame pra&is’d in this Operation, the old and Corrupt: 
being firft evacuated, to make room for new and pure. And 
thofe alfo that decry bleeding, as that which too much weak- 
ens the lick, will have no reafon to complain, fines the new 
blood condueeth to ftrengthen them more. 
Laftly, Every one knows that many perfons dye through 
loft of blood, and H^morrhagies hot to be ftopt, many are 
emacerated by them, and others precipitated into untimely 
old Age, by defedf of blood and vital heat. Now who 
doubts but the Transfufon of a mild and laudable blood may 
preferve the pne, and prolong the life of the others. A man 
may forefee fome benefits and advantages from this Operati- 
on in Thurifies , the [mall Pox , Leprofies, Cancers , Vlcers , St. 
Anthonies fre , Madnefs , Dotage , and other Maladies arifing 
from. the Malignity of the blood : But the fuccefs is rather 
to be expected in Experiments, which will be made within a 
little time. In the interim, give me leave to acquaint you 
with my Judgment concerning the Ele&ion of the Animal 
that is to communicate its blood. 
Many have conceiv’d, That if ever the Transfu/en of blood 
fhould come to be pra&is’d upon men , it ought to be done 
with blood of the fame Species s and confequently, That it 
would be a very barbarous Operation, to prolong the life of 
fome, by abridging that of others. But for my part , l am 
far from that Opinion, and I amperfwaded that ic will be much 
more expedient to makeufe of the blood of other Animals , 
than of that of men, formany reafons, the chief whereof are 
thefe. 
i. Tis eafie enough to judge, That the blood of Animals 
is left full of impurities, than that of men s becaufe debauch-' 
ednefs and irregularity in eating and drinking, are fo ordina- 
ry io thenij as to us. Sadnefs, Envy,Anger, Melancholy, Dift 
quiet, and generally all the Pailions, are as fo many caufes 
which trouble the life of man, and corrupt the whole fub- 
ftance of the blood : Whereas the life of Brutes is much more 
regular, and lefs fubjeft to all thofe miferies, which we ought 
to confider as fad confequences of the prevarication of our 
firft Parents, And indeed Experience fufficiently fhews ns, 
D d d 2 That 
