(200) 
ExtraS of another Letter ivrittm by the fatm^ concern- 
ing two Experiments made for finding another Paffage of 
the \Jx\nt^ bejides the k^ovpn ene^-^ as alfo fome Circtim- 
fiances relating to thefrecedent Invention of making Sta- 
water potable. 
^TJ AvingbeeOj not long fince, employed in iearching 
171 after the P^ffage of the Vrine in 
AnimalsJ made/or that purpofeja Dog drink ^ ^^/^'^/f^J^*^*'^ 
a good quantity of water.and thereupon cau- ^rffyMltaZ 
fed his Vreters to be well tyed about, acd em- Num.55.p.2oS4, 
ptied his bladder* After two hours I found 
the Bladder empty, and the Vreters were not tumid above 
the Ligature. Being furprifed thereat^ 1 believed, that the 
caufe might be the too much cooling of the inward parts, that 
had all this while been expofed to the Air 5 the Sefiioo ha^ 
ving been made Crofs^wifej afrerthe ordinary manner. To 
avoid this inconvenience, I thus reiterated the Experiment 
upon another Dog ; I caufed a fmall opening to be made oa 
each fide, fufficient to find and to tye the UreterSj and to 
fqueefe the Urine out of the Bladder, by prefliog it with ones 
hand. This done,! made thefe Openings to be fow'd upagaio-^ 
and then having made the Dog drink good (tore of water, I 
left him for near three hours in theleall: violent pofturethat 
his Ligatures would permit* Afterwards having opco'd 
both the holes, and the Bladder being prefled with the hand, 
there iffiied out of it a pretty quaotky of UnuQ^ and theUf 
reters feemed to be a little fwelled above the Ligature. Thf's 
Operation was made with great exaftnefs^ but yet as it is 
of importance for difcovering the way of the Llrinej I would 
have repeated it often, if 1 had not been obliged haflily to 
come away from the place where I then was^ I am not now at 
leifure to try it again 5 but I exhort you > ^Sir ^ to engage 
fome of your beft Anatpmifts, among other refearches to em- 
ploy themfelves in this Inquiry* 
M m 2 ■ -Monfieur 
