Grains_.

The same put under water for a night, and somewhat more, became
transparent, and the superficies being wiped dry, weighed 6-3/256
_Grains_.

The difference between these two weights, 0-50/256 of a _Grain_.

The same Stone kept out of water one Day and becoming cloudy again
weighed, 5-225/256 _Graines_.

Which was more then the first weight, 0-16/256 of a _Grain_.

The same being kept two Days longer weighed, 5-202/256 _Graines_.

Which was less then at first, 0-7/256 a _Grain_.

Being kept dry something longer it did not grow sensibly lighter.

Being put under water for a night and becoming again transparent and
wiped dry, the weight was, _6-3/256 Grains_, the same with the first
after putting in water, and more then the last weight after keeping of
it dry, 0-57/256 of a _Grain_.

Another Stone of the same kind being variegated with milky _white_ and
_gray_ like some sorts of _Agates_, while it lay under water, was
alwaies invironed with little Bubbles, such as appear in water a little
before boyling, next the sides of the Vessel.

There were also some the like Bubbles on the Surface of the water just
over it, as if either some exhalations came out of it, or that it did
excite some fermentation in the parts of the water contiguous to it.

There was little sensible difference in the transparency of this Stone,
before the putting under water, and after: To be sure the milky-_white_
parts continued as before, but more difference in weight then in the
former. For whereas before the putting into the water the weight was
18-97/128 _Graines_. After it had lyen in about four and twenty hours
the weight was 20-27/128 _Graines_, so the difference was, 1-58/128
_Graines_.

The same Stone was infused in the water scalding hot, and so continued
for a while after it was cold, but got no more weight then upon
infusing in the cold, neither was there any sensible Difference in the
weight both times.

In which Experiment, there are three Observables that seem very manifestly
to prove the porousness of these seemingly close bodies: the first is their
acquiring a transparency, and losing their whiteness after steeping in
water, which will seem the more strongly to argue it, if what I have
already said about the making transparent, or clarifying of some bodies, as
the white powder of beaten