(49^) 
thofe of the Blood. On the contraryjas 'tis certain that cooling 
Meats or Medicaments ferve to temper the heat of the Blood 
when itboilesin the Veines, and hot food or Phyfick excite 
new vigour in fuch blood, as old age or a Difeale hath ren- 
der'd torpid and coagulated in the Veffelsifo 'tisasreafonable 
to infer, that great advantages will follow upon the mixture of 
different bloods^ provided the fame be direiSed and manag'd 
by the ordinary prudence of able Phyfitians 5 and that if a hot 
Blood can reinfufe new flrength into that which languifheth 
with coldnefs , fuch blood as hach colder qualities, may aifo 
check the Ebullitions and Tumults of that which is overmuch 
chafed. 
As for the authority of Hippocrates y who faith that extrava- 
lated blood corrupteth, It is no wife repugnant to our preten- 
fions. For to falve the honor of that great Perfon, his mean- 
ing muft be rightly expounded , which is bo more but this 5 
that the Blood ncceffarily corrupteth when it is out of the Vef- 
lels, which prcferve its heat, and which permit it a natural mo- 
tion and free circulation, whereby it purifieth it felf continual- 
ly. For example, being extraifted into adifli, wherein all its 
parts are ftopc and coagulated , it muft in a little time alter 
its conflitution, as experience witnefTeth. Nor doth this 
hinder but that it is alfo corrupted fometimes in its own place, 
contrary to that Aphorifme, §uicquU corrumpitur, in loco alisno 
^orrumpitur : For if its motion be interrupted in the Veines ci- 
ther by fome obflrui^ion form'd therei», or fomc divifion oc 
caliondby a Wound or Contufion, itcortupteth in a fliort 
fpace and degenerateth into purulent matter. But in this Ex- 
periment of Tranifufion, the Blood is communicated in fuch 
manner , and pafTeth out of one animal into another , that 'tis 
impoffible its natural motion fliould be interrupted. 'Tis true 
it paffeth through unnatural Conduits, but thef e being once 
warmed and admitting no air into their cavities, they caufe no 
more alteration in the Blood than the Arteries and Veines 
ihemfelves do. 
Moreover, fuch as conceive that the blood Transfufed 
muft 
