''212 On the Animal Calculus. 
Experiment VI. 
I. '^Hinking it might poffibly be of ufe in 
Experiments of this kind, to have a 
continual Flow of Liquor in and out of the 
Bladder, I directed an ingenious Artifl: to 
make me a double Catheter^ the Cavity of 
which was divided lengthwife by a thin Par- 
tition, into two feparate Channels which end- 
ed in two divaricating Branches. To one of 
thefe Branches was faften’d an Ox^s Ureter, or 
the Windpipe of a Goofe or Turkey, which 
by means of a Glafs Tube either communi- 
cates with or has Water flowing from a ca- 
pacious VeflTel, placed three Feet above the 
Catheter : So the Liquor as it flows from the 
Veflel, runs thro* the one half of the Cathe- 
teVy and flows into the Bladder, and then re- 
turns out of the Bladder thro’ the other half of 
the Catheter. 
1. Thro’ this Inflrument I caiifcd twenty 
three cubic Inches of the diflblving Liquor to 
flow in and out of the abovementioned Bitch s 
Bladder in a continual Stream : And after 
that for four Hours and a half, there ran in- 
.ceflantly in and out in the fame manner a' 
Scream 
