vince you that we are not culpable of the rafhnefs wherewith 
wemay poffibly be charged : bepleafcd to permit me to re- 
late to you in few words the reafons alledg'd by forae perfons, 
t:o oppofe our defign, and to compare the fame with thofe 
which engag’d us to execute, and by certain degrees carry it 
on to that perf e&ion wherein it is at prefent. 
You have heard of the tryal we made about four monetbs a- 
goe upon Dogs, to tranfmit the Blood cf the Crural Artery of 
one into the "jugular Vein of another. And being this operati- 
on even at the firft attempt fucceeded as happily as we could 
wife, according as it is more at large fet forth in the Journal des 
$ favour , of M.arcb laft 5 we were encouraged to repeat the 
fame feveral times both in publick and private, and we added 
fo many circumftances to the manner of performing it, that 
its eafinefs feemed to invite us not to neglect it, but to make 
abundance of Obfervations which might be of fome benefit 
in Pra&ice. 
Accordingly, We afterwards made the. Transfufion feve- 
ral waies, fometimes from an Artery into a Vein , fometimes 
from one Vein into another , both in thofe of the Neck, and thofe 
of the Leg * in Dogs both weak and ftrong , great and fmall ; 
as alfo in fueh as had already either received or communicated 
blood in former transfufions. And not finding oneof nineteen 
to die, but on the contrary alwaies obferving fome furprifing 
effect in all fuchas had received new blood, we wereftrongly 
perfwaded that the transfufion would have no fuch dangerous 
confequences, as fome people endeavor’d to prefage. 
Wherefore we refolv’d to drive the bufinefs yet a little fur- 
ther, and not contented to have feen it happen well in fubje&s 
of one and the fame fpecies > we thought good to try it in 
fome of a different fpecies, and accordingly we took a Calfe 
and a Dog ; becaufe we conceiv’d the blood of thefe Crea- 
tures altogether diffimilar. In your prefence we tranfmitred a 
Calfs bloody into a Dogs Vein? , on the 28. of March ; fince which 
time we have alfo done the fame upon other oecafions, al- 
lies adding fome what new towards the facility of the Ope- 
ration. 
