On the Animal Calculus. 223 
like that of the Mucus of the jNFofe when 
dried : And that it cannot incruft in the Blad- 
der to form a Calculus ; whence he concludes 
that it docs not arife from this Mucus^ but 
from a pare of the Urine which adheres to 
Urinals. 
II. Tho* he filtrated Urine thro* Lineh 
yet it ftill depofited its Tartar, whence he 
concludes that the Tartar was not formed 
when the Urine was firft voided 5 or if it had 
paffed the Linen in the Form of Sand, then 
It would have precipitated, like Sand or Se- 
diment, to the bottom of the Urinal, and 
not have adhered to the Sides at equal Dif- 
tances ; bccaufe it would have wanted, he fays, 
a Glue whereby to have adhered to the Sides. 
15. And fince, as he further obferves, this 
Sand is no where glutinous, but where it ad- 
heres to the VefTel, it is, he fays, hence evident, 
that this Sand adheres at the inftant it is form- 
ed : And this Sand is formed and adheres to 
the Veffel long after the Urine is made,' when 
it begins to putrify, the very inftant before it 
fixes. To which more and more Ls continu- 
ally added,- And in the fame manner he con- 
cludes the Calculus to grow. He obferves 
this Tartar to adhere fooner and in greater 
Plenty 
