284 
Of (ferns. 
Part III. 
A THIRD, growing upon a Bed of the fame colour ; 
^jOf Gems, but opacous. Mr. Boyle ( a ) mentions a piece of Cryftal, an 
(b) Muf. one part of a wKmr aid-green. And Terzagi (ft) another that 
Sept. was black. 
A Crftyal COLUMN, naturally inclofing a kind of Mofs 
(or the likenefs of it) at one end of the Column of a paler, 
at the other of a dark Green. Tis above I a foot in compafs. 
ANO'i HLR piece of ( RTSTAL in which is immerfed 
a Mody fubftance of a redilh colour. And there are fome 
Cryflals have been known naturally to enclofe a Li¬ 
te) Mr .Boyle, qUOr. (c) 
p/ 43™& /} ^ >1 f ce polifhd CRYSTAL in the figure of a half 
Muf. Calc. Globe. Tison one fide flaky, and hath many very fmall 
Rubles , by which it appears cloudy. 
ANOTHER Piece polifh d into a Spherical Triangle,and 
fomewhat Oval. 
A THIRD Piece polifh’d into a Cone. 
A Maily Piece of CRYSTAL. Not pointed, nor an¬ 
gular ; but of a roundifh figure 5 much bigger than any 
mans head. One way, near a yard in compafs 5 the other, 
above three quarters. In weight, thirty nine pounds and a 
\ Llaverclupoife. Yet is it very clear, beyond the cleared: 
Ice oi the fame thicknefs. The biggeft piece of Cryftal l 
nd mention d elfe-where, is a Ball of fix and thirty ounces 
in Sept alius s Mufaeuvi. 
Cryftal, at leaft fome forts of it, is the fofteft, faith Boe- 
cd) Lib. 2. tius, (a) of all Gems. He fhould have ftid, of all perfpi- 
c ' 73 '■ '■ cuous Gems: for the Turcots is much fofter. The molt 
0)Muf.Sep- l ‘iual Figure of Cryftal, is Sexangular: yet Terzagi (e) 
tai.c.p.n.54. mentions a Rock of fquare pointed ones. But it is obfer- 
vaole, That he faith the Bed on which they grew, feem’d to 
be Gola-Ore. If fo, it might proceed from fome govern- 
ing principle in the Ore. For I have heard it noted, as I re¬ 
remember, by Sir Chriftopher Wren, That Grain-Goldk of- 
i-ui found naturally figurd into Cubes. Cryftal grows in 
molt Countries, both cold and hot: the Globous, efpecially 
m Bohemia and Silecia. 
rf) Boet.de f A bh-achm (/) of the Powder of Cryftal, with Oil of 
Gem. & L. ^ et Almonds , a prefent Remedy for thofe that have 
m is' C 7+ ’ ta ^ en , bhmate. As alfo for bilious and chylous Diarrheas. 
(1) Terzagi w When Calcin'd, by fome called Puhj'vs Cafaris, of ex- 
Muf. Sept, cellent ufe againft the Epilepfte. {h) An 
