Afterwards I view'd it every way with a better _Microscope_
and found it on both sides, and edge-ways, to resemble the Shell of a small
Water-Snail with a flat spiral Shell: it had twelve wreathings, a, b, c, d,
e, &c. all very proportionably growing one less than another toward the
middle or center of the Shell, where there was a very small round white
spot. I could not certainly discover whether the Shell were hollow or not,
but it seem'd fill'd with somewhat, and 'tis probable that it might be
_petrify'd_ as other larger Shels often are, such as are mention'd in the
seventeenth _Observation_.
* * * * *
Observ. XII. _Of _Gravel_ in Urine._
I Have often observ'd the Sand or Gravel of Urine, which seems to be a
_tartareous_ substance, generated out of a _saline_ and a _terrestrial_
substance _crystalliz'd_ together, in the form of _Tartar_, sometimes
sticking to the sides of the _Urinal_, but for the most part sinking to the
bottom, and there lying in the form of coorse common Sand; these, through
the _Microscope_, appear to be a company of small bodies, partly
transparent and partly _opacous_, some White, some Yellow, some Red, others
of more brown and duskie colours.
The Figure of them is for the most part flat, in the manner of Slats or
such like plated Stones, that is, each of them seem to be made up of
several other thinner Plates, much like _Muscovie Glass_, or _Englsh Sparr_
to the last of which, the white plated Gravel seems most likely; for they
seem not onely plated like that, but their sides shap'd also into _Rhombs_,
_Rhomboeids_, and sometimes into _Rectangles_ and _Squares_.
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