($p) 
$. That in thofe Planes, where Ibme 
places have been left without any Chry« 
ftallin matter conjoyn’d,a new Chryftal- 
Jin matter, coming and fpreading it felf 
upon the fame places, formeth cavities 
there; at times produceth divers plates, 
fometimes includeth part of the external 
fluid,which is either meer Air,or Water 
with Air. 
VI. The Externd Fluid receiveth the 
Chryjlallm matter front the fub fiance of the 
hard Bed: Whence it comes,. 
1. That Stones ot divers naturejfweat- 
ing out divers fluids, produce Chry- 
ftals of different Colours. 
2. That in one and the fame flacCy 
Ibmetimes the firft> fometimes the lajfih 
Chryftals become darker, but that in 
one and the fame Chryftal^ the parts flrft 
concreted become fometimes darker 
than the parts laft concreted, 
3. That when Oyfters, and Cockles, 
and other Bodies, are wafted under 
ground, the void fpaccs in them are fill¬ 
ed up with Ghryftal, 
VII. The Ldiotion of the Chryfiallin 
Matter^ whereby it is determined towards 
the ^^lains of the already formed chryjlal. 
