m 
to be confidcred a double motion i on 6 
which maketh the Chryftallin matter tcK 
be joyned to thefe and not to other pla* 
jces of the Chryftal; which motion, I 
guefs, is to be adferibed to the 
ting fubtil fluid \ to be illuftrated by the 
lately alledged Example of the Magnet t 
The other y whereby the new Ghryftalliii 
matter, joyned to the Ghryftal, is fpread 
over the Plain,which motion is to be de¬ 
rived from the Amhknt Fluid. Thusj 
when the Iron-Threds rife up upon aS 
Loadftone,what by the motion of the Air 
is ftruck off from one, cometh to the o- 
ther. Tq this motion of the Ambienf 
«k,hA,i^ I fliouldatttibuK, that not 
tidies the eppoftte only in ChryKalj but alio irt 
plains are parai- many Other Angular Bodies 
let to one another. i •' r i - 
the oppoiite planes are pa¬ 
rallel to one another. 
From the things hitherto difeourfed 
it might be evinced, that an Extreme 
Cold is not the eflScient caufe of Chry¬ 
ftal : Nor that it is the Afhes alone, 
burnt by the Fire, that are changed into 
Glafs: Nor the foie force of the Fire that 
produceth Glafs: Nor that all Chryftals 
Were produced in theBeginnings of things 
