5723Century I.
bottom of a Moat, where the Earth had ſomewhat overgrown it:
And
this Egg was come to the hardneſs of a ſtone, and had the colours of the
White and Yolk perfect; and the Shell ſhining in ſmall Grains, like Sugar
or Alablaſter.
this Egg was come to the hardneſs of a ſtone, and had the colours of the
White and Yolk perfect; and the Shell ſhining in ſmall Grains, like Sugar
or Alablaſter.
Another Experience there is of Induration by Cold, which is already found,
1186. which is, That Metals themſelves are hardned by often heating, and quench-
ing in Cold-water: For Cold ever worketh moſt potently upon Heat pre-
cedent.
1186. which is, That Metals themſelves are hardned by often heating, and quench-
ing in Cold-water: For Cold ever worketh moſt potently upon Heat pre-
cedent.
For Induration by Heat, it muſt be conſidered, That Heat, by the exha
2287. ling of the moiſter parts, doth either harden the Body; as in Bricks, Tiles,
& c. Or if the Heat be more fierce, maketh the groſſer part of it ſelſ, run and
melt; as in the making of ordinary Glaſs, and in the Vitrification of Earth,
(as we ſee in the inner parts of Furnaces) and in the Vitrification of Brick,
and of Metals. And in the former of theſe, which is the hardning by
Baking, without Melting, the Heat hath theſe degrees: Firſt, It Indu-
rateth, and then maketh Fragile; and laſtly, It doth Incinerate and Calci-
nate.
2287. ling of the moiſter parts, doth either harden the Body; as in Bricks, Tiles,
& c. Or if the Heat be more fierce, maketh the groſſer part of it ſelſ, run and
melt; as in the making of ordinary Glaſs, and in the Vitrification of Earth,
(as we ſee in the inner parts of Furnaces) and in the Vitrification of Brick,
and of Metals. And in the former of theſe, which is the hardning by
Baking, without Melting, the Heat hath theſe degrees: Firſt, It Indu-
rateth, and then maketh Fragile; and laſtly, It doth Incinerate and Calci-
nate.
But if you deſire to make an Induration with Toughneß, and leſs Fragility,
3388. a middle way would be taken, which is that which Ariſtotle hath well
noted, but would be throughly verified. It is, to decoct Bodies in Water
for two or three days; but they muſt be ſuch Bodies, into which the
Water will not enter; as Stone and Metal. For if they be Bodies, into
which the Water will enter, then long ſeething will rather ſoften than in-
durate them, as hath been tried in Eggs, & c. Therefore, ſofter Bodies
muſt be put into Bottles, and the Bottles hung into Water ſeething, with
the Mouths open above the Water, that no Water may get in: For by this
Means, the Virtual Heat of the Water will enter; and ſuch a Heat, as will
not make the Body aduſt or fragile: But the Subſtance of the Water will
be ſhut out. This Experiment we made, and it ſorted thus, It was tryed
with a piece of Free-ſtone, and with Pewter, put into the Water at large; the
Free-ſtone we found received in ſome Water; for it was ſofter and eaſier to
ſcrape, than a piece of the ſame ſtone kept dry. But the Pewter, into which
no Water could enter, became more white, and liker to Silver, and leſs flexi-
ble by much. There were alſo put into an Earthen Bottle, placed as before, a
good pellet of Clay, a piece of Cheeſe, a piece of Chalk, and a piece of Free-
ſtone. The Clay came forth almoſt of the hardneſs of Stone: The Cheeſe
likewiſe very hard, and not well to be cut: The Chalk and the Free ſtone
much harder then they were. The colour of the Clay inclined not a whit to
the colour of Brick, but rather to white, asin ordinary drying by the Sun.
Note, that all the former tryals were made by a boyling upon a good hot fire,
rene wing the Water as it conſumed, with other hot Water; but the boyling
was but for Twelve hours onely: And it is like, that the Experiment would
have been more effectual, if the boyling had been fortwo or three days, as
we preſcribed before.
3388. a middle way would be taken, which is that which Ariſtotle hath well
noted, but would be throughly verified. It is, to decoct Bodies in Water
for two or three days; but they muſt be ſuch Bodies, into which the
Water will not enter; as Stone and Metal. For if they be Bodies, into
which the Water will enter, then long ſeething will rather ſoften than in-
durate them, as hath been tried in Eggs, & c. Therefore, ſofter Bodies
muſt be put into Bottles, and the Bottles hung into Water ſeething, with
the Mouths open above the Water, that no Water may get in: For by this
Means, the Virtual Heat of the Water will enter; and ſuch a Heat, as will
not make the Body aduſt or fragile: But the Subſtance of the Water will
be ſhut out. This Experiment we made, and it ſorted thus, It was tryed
with a piece of Free-ſtone, and with Pewter, put into the Water at large; the
Free-ſtone we found received in ſome Water; for it was ſofter and eaſier to
ſcrape, than a piece of the ſame ſtone kept dry. But the Pewter, into which
no Water could enter, became more white, and liker to Silver, and leſs flexi-
ble by much. There were alſo put into an Earthen Bottle, placed as before, a
good pellet of Clay, a piece of Cheeſe, a piece of Chalk, and a piece of Free-
ſtone. The Clay came forth almoſt of the hardneſs of Stone: The Cheeſe
likewiſe very hard, and not well to be cut: The Chalk and the Free ſtone
much harder then they were. The colour of the Clay inclined not a whit to
the colour of Brick, but rather to white, asin ordinary drying by the Sun.
Note, that all the former tryals were made by a boyling upon a good hot fire,
rene wing the Water as it conſumed, with other hot Water; but the boyling
was but for Twelve hours onely: And it is like, that the Experiment would
have been more effectual, if the boyling had been fortwo or three days, as
we preſcribed before.
As touching Aßimilation (for there is a degree of Aßimilation, even in Inani-
4489. mate Bodies) we ſee examples of it in ſome Stones, in Clay-grounds, lying
near to the top of the Earth where Pebble is; in which you may manifeſtly
ſee divers Pebbles gathered together, and a cruſt of Cement or Stone be
tween them, as hard as the Pebbles themſelves. And it were good to make a
tryal of purpoſe, by taking Clay, and putting in it divers Pebble-ſtones, thick
ſet, to ſee whether in continuance of time, it will not be harder than other
Clay of the ſame lump, in which no Pebbles are ſet. We ſee alſo in
4489. mate Bodies) we ſee examples of it in ſome Stones, in Clay-grounds, lying
near to the top of the Earth where Pebble is; in which you may manifeſtly
ſee divers Pebbles gathered together, and a cruſt of Cement or Stone be
tween them, as hard as the Pebbles themſelves. And it were good to make a
tryal of purpoſe, by taking Clay, and putting in it divers Pebble-ſtones, thick
ſet, to ſee whether in continuance of time, it will not be harder than other
Clay of the ſame lump, in which no Pebbles are ſet. We ſee alſo in
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