'&re places left lare, fometimes toward tft 
’Angles^ fometimes toward the JideSy and 
now and then in the tnidf of the plane* 
flence it is, 
1. That the fame Plane, commonly fo 
called, hath not all its. parts fcituate in 
the fame plane, but in divers, varioufly 
{landing out above it. 
2. That the Tlane commonly fo call¬ 
ed is in many places not plane, but ap¬ 
pears gibbous. 
5. That in the intermediate Planes 
there arife inequalities Ijke fteps of 
Staires. 
V, ChrjBallin matter joyned to Planes 
ftpon the fame planes^ is by the ambient 
Fluid dilated^ and by degrees hardned. 
Whence it follows, 
1. That the furfacc of Chryftal be¬ 
comes the fmoother, the more flowly 
the matter joyned is harden’d, and that 
it is left altogether rough, if the faid 
matter be hardned, before it is fufficient- 
ly expanded. 
2. That the manner may be difcerned, 
how the Chryftallin matter is joyned to^ 
Chryftal 5 in regard that, where it hath 
been concreted fuddcnly, it affords a fur- 
' ".' ■ faeg 
