(fl) 
of Marcafites were produced hfore thes 
pfbdudion of the Beds, wherein they 
lye; hut Ghiyftals are coagulated a/tCK 
the produdion of the Beds. 
As to the Place of produftion t 
For, Chryftal, at leaft whilft it was con¬ 
creting, was incumbent on a Solid Body, 
and conlequently was contained in a 
place partly folid, partly fluid : But the 
Cubes of Marcafites fecm to have been 
concreted betwixt two fluids, confidcr- 
ing that even in the greater Cubes of 
them there are no marks extant of any 
cohsefion with another body ; though 
often there be found fmall Cubes, which 
in the concreting have come to adhere to 
one another in the fiirface of the fluid. 
But now, that fuch kind of heavy Bodica 
can remain on the top of a fluid, whilft 
one furface of therh is immediately tou¬ 
ched by a fuperincumbent Fluid of ano¬ 
ther nature, and lighter, the folid dc- 
monftrations of the Great Galileo do e- 
viirce* That of the faid fluids one hath 
htm i^queous .y the matter of the Bed 
fheweth, which hath fiiblided oat of the 
^nic Fluid. 
As to the MafiKcr and Place of A p- 
F 4, . poft'oii. 
