250 Oil the Animal Calculus. 
Means, to void it as foon as poflible after ic 
is fallen into the Bladder, before ic be grown 
coo big to pafs. I fufpeft that a principal Rea- 
fon why many Scones do noc pafs off, is this, 
'viz. the Scone by ftimulacing the Neck of 
the Bladder, caufes a frequent Endeavour to 
make Water, when there is but little in the 
Bladder, whereby for want of a fufficienc 
Quantity of Urine to impell ic forward ic Is 
retained: Whereas did the Patient contain 
his Water till the Bladder was well filled, there 
would noc only be a greater impelling Force 
to pLifli forward the Stone, but the Sphinfrer 
of the Bladder would alfo be thereby the more 
dilated, and Co make more room for its Paffage, 
cfpecially if the Urine were made mucilagi- 
nous by proper Drinks. And in cafe it (hould 
noc by this means pafs off, but caufe a total 
Suppreffion of Urines ic is well known that 
a Surgeon can eafily remove it, by means of 
a Catheter; which Removal may pofiibly cauie 
ic to lay in a fitter Pofture to pafs off another 
time. 
30. While I was intent upon thefe Expe- 
riments on the Calculus^ ic occurred to my 
Thoughts, that large Gravel Stones, which 
often dick for fcvcral Days in the Urcthray to 
the 
