(490) 
vince you that we are not culpable of the raflinefs wherewith 
we may poffibly be charged : bepleafed to permit me to re- 
late to you in few words the reafons alledg d by fome perfons, 
to oppofe our dcfign, and to compare the fame with thofe 
which engaged us to execute, and by certain degrees carry it 
on to that perf e<9tk)n wherein it is at prefent. 
You have heard of the tryal we made about four moneths a- 
goe upon Dogs, to tranfmit the Biood of the Crural Artery of 
one into the 'ju^dar Vein of another. And being this operati- 
on even at the firft auempt fuccecded as happily as we could 
wifli, according as it is more at large fet forth in the 'journal des 
Sfavans^ of M/^rr^ 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 negledl it, but to make 
abundanceofQbfervations which might be of fome benefit 
inPraftice. 
Accordingly, We afterwards made the Transfufion feve- 
ral waieS) fometimes from an Artery into a Vein , fometimes 
from one Veininto another^ both in thofe of the Neck, and thofe 
aftheLeg^ in Dogs both weak and ftrong , great andfmall; 
as alfo in fuch as had already either received or communicated 
blood in former traosfufions. And not finding one of nineteen 
to die^ but on the contrary alwaies obferving fome furprifing 
efFediin all fuch as had received new blood, we were ftrongly 
perfwaded that the transf ufion would have no fuch dangerous 
confequenccs, as fome people endeavor'd to prefage. 
Wherefore we refolv'd to drive the bufinefs yet a Unle fur- 
ther, and not contented to have feen it happen well in fubje(3: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 weconceiv'd the blood of thefe Crea- 
tures altogether diffimilar. In your prefencewe tranfmitted a 
Calf s hloodjnto a Dogs Veinr^ on oi M3>rcb\ fince which 
time we have alfo done the fame upon other bceafions, al- 
waies adding fomewhat new towards the facility of the Ope- 
ration. 
