98 
MicroGRAPHIA. 
te of Vrine would very readily and eafily fink into it, as ‘would alfo 
everal tinctures drawn with fpirit of Wine. 
Nor is A¢arble the only feemingly clofe ftone,which by other kindeof 
Experiments may be found porous; for I’have by this kind of Experi- 
ment on divers other ftones found much the fame effect, and in fome, in 
deed much more notable, Other {tones I have found fo porous, that with 
the Aticrofcope 1 could perceive {everal fmall winding holes, much like 
Worm-holes,asI have noted in fome kind of Purbeck-ftone, by lookingon 
the furface of a piece newly flaw’d off; for if otherwile, the furface has 
been long expos'd to the Air, or has been feraped with: —_ tool, thofe 
{mall caverns are fill’d with duft,and difappear. 
And to confirm this Conjetture, yet further, fhall heré infert'an excel- 
lent account,piven into the Royal Society by that Eminently Learned Phy- 
fitian, Dottor Goddard, of an Experiment, not lefs inftructivefthen. curi- 
ous ‘and accurate, made by himfelf on a very hard and feemingly clofe 
ftone call’d Oculus Mundi, as V find it preferv'd in the Records of = 
Honourable Society. 
“A fmall ftone of the Jad: call’d by? faite Authours, Oculus 
Mond, being dry and cloudy, weigh’d 5 2% Grains. 
_ The fame put under water for a night, and fomewhat more, 
became tranfparent, and the fuperficies being wiped dry, 
weighed 6 Grains. | 
The difference between thefetwo weights, o “of a Grain. 
‘The fame Stone kept out of water one Day and: becoming 
etpiity again weighed, 5% Graines. 
Which was more then the firft weight, o-% ‘of a Grain, 
The fame being kepttwo Days longer weighed, 5 Graints. 
Which was lefs then at firft, o% of a Grain. 
Being kept dry fomething longer it did not grow fenfibly 
lighter, 
Being put under water for a night sa becoming: again ane 
parent and wiped dry, the weight was, 63, Grains, the fame 
with the firft after putting in Water and more then the laf 
weight after keeping of it dry,02 of a Grain. 
_ Another Stone of the fame kind ‘being variegated with milky 
white and gray likefome forts of Agates, while it lay under water, 
was alwaies invironed with tittle Bubbles, fich as appear in 
