& entury I 
ae of a Moar, where the Earth had foitiewhat overgrown it: And 
| this Bgg was come to the hardnefs of aftone, and had thecolours of the 
| Whiteand Yolk perfeé ; ae the Shell fhining in {mall Grains, like Sugar 
j or Alabla‘ter. . 
he Read hagicherlencathiere i is of Induration by Cold, which is already Wetind, 
| whiclvis, That Afetals themfelves are hardned by often heating, and quench- 
| ing in Cold-water : For Cold ever worketh moft potently upon Heat pre- 
| cedent. 
} For Induration by Heat, it mutt be confidered, That Heat, by the exha- 
| ling of the moifter parts, doth either harden the Body; as in Bricks, Tiles, 
| Se. Orif the Heatbemore fierce, maketh the groffer part of itfelf, run and 
|e rele, -as inthe making of ordinary Giafs, and in the Vitrification of Earth, 
‘| ¢as we fee in theinner partsof Furnaces) andinthe Vitrification of Brick, 
| atid of Metals. And in the former of thefe, which is the hardning by 
| Baking, without Melting, the Heat hath thefe degrees: Firft, It Indu- 
; rateth, andthen maketh Fragile; and laftly, Ic doth Incinerate and Calci- 
pate 
i: / Butif you dere to make an Induration with Touginef, and le{s Mragility, 
ja middle way would be taken , which is that which eAriforle hath well 
|aoted, but would be throughly verified. Itis, to decoaé Bodies in Water 
‘| for two or three days; but they mutt be fuch Bodies, into which’ rhe 
| Water will notenter ; as Sconeand Metal. Forif they be Bodies,. into 
which the Water will enter, then long feething will rather foften’ than in. 
it durate them, as hath been tried in Eges, &c. Jhercfore, fofter. Bodies 
| the Mouths open above the Water, thatno Water may get in : Por by this 
| Means; the Virtual Heat of the Water will enter; andfuch a Heir, as will. 
| be thu: out, This Experiment we made, and it forted thus, It was tryed 
with a piece of Free-ftone, and with Pewrer, put into the Water at large3 the 
| Free-ftone we found received infome Water; forit was fofter and eaficr to 
Pees thana piece of the fame ftone kept dry. Butthe Pewret, into which 
jno Water could enter, became more white, and likerto Silver, andlcfs:flexi- 
| ble by much. There were alfo put into an Earthen Bottle, placed as before, a 
| good pellet of Clay, apiece of Cheefe, apiece of Chalk, and a piece of Free- 
|ftone. The Clay came forth almoft of the hacdnefs of Stone: TheCheefe, 
| | likewile very hard, and not well tobecut: The Chalkandthe Free ftone 
{| mach harder then they were. The colour of the Clay inclined. not a whit to 
| the colour of Brick, but rather to white, asin ordinaty drying by the Sun. 
Note, that allte former tryals were made by aboylingupon a good hor fire, 
| renewing the Wateras itconfumed, with other hor Water ; but the boyling 
| | was bur for Twelve hours onely : And itislike, that che Experiment would 
have been mote effedtual, if the boyling had been fortwo or three days, as 
| we prefcribed before. j 
| _ Astouching 4fimilation (for thereis a deste of Afgimilation, even in Lhani- 
} mate Bodies) we fee examples of it in fomie Stones, in Clay-grounds, lying 
led tothetop of the Barth where Pebble is ; in which you may manifeftly 
fee divers Pebbles gathered together, and a cruft of Cement or Stone be- 
tweenthem, as hard asthe Pebbles themfelves. Andit were good to make a 
| ‘tryal of purpofe, by taking Clay, and putting in it divers Pebble={tones, thick 
fet, to fee whether in continuance of time, it will not be harder than other 
i ah of the shea in which no Pebblesare fet. We fee alfo' in Ruins 
| 
‘ 
puft be put into Bottles, and the Bottles bung into Water feething, with 
| not make the Body aduft or fragile: But the Subfance of the Water will | 
Le Seep wae eae OUT 
23 
36. 
$7. 
33, 
See 
