(491) 
ration. Yet in all thefe Experiments we never could obferw 
any indifpofition in the Dogs which received the Blood i 
whence we became confirmed in the Opinion 5 that there was 
more ground to hope cfftdls rather ad vantageous than hurt- 
ful to mankind,from this difcovery of Transfofion of Blood, 
Neverthelefsj that we might vent nothing unadvifedly, we 
publiftit thefe ExperimentSj and were well pleafed tounder- 
ftand the judgment of the ableft Philofophers and Phyfitians, 
upon the matter we examin'd, whether any of them had rea- 
ions weighty enough to diffuade us from carrying on our try- 
als even in Man; and I befeech you permit mc to fum up the 
principal here which are come to my knowledge, and judge 
your felf whether they ooghc to have ftopt us.and whether we 
defervepraife or blame fur having proceeded farther. Some 
have attaqu'd this defign by decrying it as Chymerica! & im- 
polBble, J. Bw Caufe the diverficy of Complexions (which is 
founded in the Blood) fuppofeth fo great a diverfiry in the fe- 
vera! Bloods of diiferent Animals, thar'tis impoffible but one 
muft bePoyfonand Venome in refpedt of another. 2. Be« 
caufe Blood entravafated or remov'd out of its natural place, 
muft neceffarily corrupt, according to the didate of Hyppo- 
crates. 3, Becaufe the Blood iffuing out of its proper Vef- 
felsj and being to pafs through inanimi^ed conveyances, fuch 
as are ihe Pipes or Tubes employ'd in the Trans fufion ; it 
muftinfiillibly coagulate^-^nd fo coagulated defcendingto the 
heart muft caufe there a Palpitation, whereof death will be the 
fpeedy confequenr. 
Thefe Reafoni have not appeared to us of great impor» 
tance. For as to the firftj we acknowledge that there are as 
many different complexions and various qualuies in the bloodj 
as there are Individuals in every Species : But we believe it not 
conclufiblc from thence, that the Blood of one muft be Poy- 
fon in refpe(9:of others i no more than it follow?, that all the 
Meats wherewith we are nourilht, and whereof oiir Blood is; 
only an Ehxiror Qaioreffence, muft corrupt and poifon the 
fame, becaufe they arc endu'd with qualities differing fron^ 
Ccc2 thofe 
