(7io) 
Aft Extract 
Of a Printed Letter y addrejfed to the Publiflier, hy M. Jean Denis, 
D.cf Phyfick,and Prof of the Mathematicks at Vdx'isjouching 
the differences rifen about the Transfufion of Bloud. 
After that the Author of thefe Tracts, having been defired from his Parifian • 
correspondents 3 to inform them^ whether the Magiftrate of London had forbid 
the ufeofthe Transfufion 0/Bleud {as it was there noifed) had affured them 9 
That he never he ard^t hat any Magiftrate in England had fo much as concerned 
themfelves in this matter ^ and after that alfo the faid Author had defired par- 
ticular information of the Intrigues 3 ufed in thofe parts to perplexe the matter of 
faff in the prattice of ^Transfufion on a certain diftratled man at Paris ^ 
Monfieur Denis was pleafed to oblige the Publiftier by giving him the Infer' 
mation as it was printed at Paris with privilcdge ; which was thought fit to be 
here inferted in Eng\i(hj he better to fatispe the Inquifetive of thefe parts about 
the faid matter of Fail, and candidly to declare the truth of that whole affair, 
Sir, you have fenfibly obliged me to have affured me by your Letter of 
April 29, That the Magiftrate of London had not at all concern'd them- 
felves to prohibit the Practice of the Transfufion of Bloud ^ and that that 
operation had been hitherto practifed with good fuccefs on Brutes, and 
without any ill confluence upon a Man. The Enemies of New Discove- 
ry's had taken fo great care of publifhing every where this fa(fe News to 
decry this Experiment, that there needed an authentick teftimony to dif- 
abufe the multitude. If one fhould undertake to diflipate all the falfe ru- 
mors, they fpread touching this matter, one (hould never lay afide the Pen ; 
but the beft of it is, that men of difcretion do fo much difdain thefe wild re- 
ports, that they hearken no more to them but with difguft. And as to me,T 
was refolv'd to write no more of it, until fome new Experiments had firft 
countenanced my firft Conjectures. But your laft Letters do fo civilly engr ge 
me to impart to you the fecret cab ale ^ practifed by fome perfons to em- 
barafstheHiftory of that Mad man, that was cured fix moneths ago by the 
means of the Transfufion^ that I could not omit fending you the fumme of 
what hath hitherto pafs'd upon that fubject, expecting mean time,what the 
Parliament of P^r/*, who, I believe, will be the Judges and Arbitrators 
thereof, fliall determine therein. 
You already know, that the T ransfufion of Calve s-bloud did fo temper the 
exceffive heat of the Blond of the Mad man, who for four moneths had run 
naked up and down the ftreets night and day ^ that he fell afleep two hours 
after the Operation, and that after ten hours fleep he awaken'cM)eing in 
good fenfe , and that he remaind in that good condition about two 
Moneths, until the too frequent company with his wife,and his debauches 
in Wine^Tobacco, and Strong Waters had call him into a very violent and 
dangerous leaver. 
You may alfo have heard, how that this Operation had effects quite con- 
trary at the fame time, and that for one Brain cooled thereby, it fired many 
for- 
