230 07t the Animal Calculus. 
of the Ureters, where they difcharge them- 
felves into the Bladder, (hews the Impor- 
tance of the Urine's not prefling on the Ori- 
fices of the excretory Duds of the Pelvis. 
Ruyfch obferved the Kidnies of a Sheep ex- 
tended to the Size of a Pint, occafioned by a 
Stoppage of Urine in the Bladder; and 
doubtlefl, leflcr Degrees of PrefTure on thofc 
Du£lSy will proportionably incommode their 
Secretions. 
I o. And for the fame Reafons, it mufl: needs 
be advifeable, to take care to lay alternately 
fometimes on one Side, and fometimes on the 
other : For fince while we lay, fuppofe oa 
the left Side, the excretory Dn£is and Sinus's 
of the Kidney, will be in a low depending 
Poflure, for the Recrement of the Urine to 
fix in them ; while at the fame time the ex- 
cretory P)u^s and Sinus's of the right Kidney 
will be in fiich a fuperior Poflure, as that the 
feparated Urine freely flows from them, and 
vice verfa when the right Kidney is lowermofl. 
Therefore it Teems to be of no fmall Impor- 
tance, to change Sides alternately, that what- 
ever Sediment may have been fettled in the in- 
ferior Kidney, may by inverting it, be waflied 
out, before it have time to fix into (inall Sand 
and 
