On the Animal Calculus. 225 
inofl: rancid, as is in the like Cafe the Milk 
of Women ; becaufe it has not only been 
longer a digelling in the Blood, but alfo bc- 
caufc the more watry part goes off firfl: in 
greateft Proportion : And its being more ea- 
fily retained in the Bladder, chan the higher 
coloured Urine, fhews that it is lefs rancid and 
ftimulating, than a higher coloured Urine. 
17. Whence it feems probable, that the 
Stone does not increafe with an equable Pro- 
greflion, in chofe that arc fubjeft to it, but 
fafter or flower, in proportion to the more 
diuretic and diluted, or more rancid State of 
the Urine. Whence we may not unreafona- 
bly conclude, that the Scone incrcafes fafter in 
the Summer, when a greater Proportion of 
Moifture is perfpired oft', and the Urine ren- 
dered thereby more rancid, than in the Win- 
ter, when the Perfpiration being diminiflied^ 
a greater Quantity is difeharged by Urine. 
Add to this that Heat is obferved to contri- 
bute to the Induration of many Bodies. Are^ 
t^etis on the contrary imagined the Calculus to 
be increafed moft in Winter and Autumn, viz. 
from a fuppreffed Perfpiration. 
18. The Lamina or Cloves which are ob- 
ferved in many of the Calculi^ are a further 
Confirm 
