^wbrk ro laborious to his whole body that it might almoft tire a 
horfe; thus he fpcnt all the afcernoon, and fo kept us from ma- 
king fuch obfervations upon him as we had intended. I met 
him the next day in the ftreets, and underftanding from him- 
felf this behaviour, I was furprifed at it , and blam'd him of 
imprudence. But he told me in excufe of hirafelf, that he could 
not be at reft when he was in health, that he had felt no paiti 
either during or after the operation, that he had eaten, drank 
and flept very well, that he had more ftrength tha n before, thac 
if we were minded to repeat the fame experiment at any time, 
he defired we would choofe no other perfon for it but him, 6c 
that another time he would lie down to reft, and punftually 
behave himfelf as we fliould command him. 
This is an account of ourExperimentSj which indeed have not 
yet proceeded very far^ neverthelefs I could not longer con* 
ceale them from your curiofity,knowiug well that from thefc 
£e\^ obfervations you will for fee confequences and advantages 
enough; lhave not defcribed the manner of our making this 
Experiment upon man^which is very difl^rent; from that which 
weufeuponbeafts: but the particular relation would be bat 
tedious and ufelefs to you, finceyou will behold it more plainly 
in an example when ever you fhall find a convenience to com- 
mand us to make the fame before you* And I afford my felf^ 
you will therein admire the dexterity and fagacity of Mr* 
£mmeri^ ^zhd confefs that hisinduttry renders him as happy 
in this operation as in many others of Chirurgery which ara 
fnuch more difficult; for indeed 'tis done with as m^ach fpeed as 
an ominary phlebotomy, and he thai receives new blood com- 
plains not of any pain that be feclsv 
But I perceive that I abufe your patieoce^and that the length 
of my letter hath pafTed the bounds wherein the refpexft I have 
for the perfon ought to confine me, I befeech you pardon me 
this hberty, and be not difpleas'd that I t^ke this occafipn to 
confeerate to you my moft humble fervice^ and to affure you 
thati arti, 
' ■. Sky ToHv moft hHmhlemdthdmtfer'uamtf 
i^ams, June i66^^ 
% DENIS. 
L&JNpoN!, Printed for John Martifty at the fign of the Bell, 
a little without T<?^/?/^-fi«r. 1667. 
