2t Dr- Eafon on Cryjlallization . 
the fubftance is prefented to us by nature in five 
different fhapes, to each of which naturalifts 
have given different names; firft, the Lapis 
Specularis. 2dly. Striated Gypfum. 3dly. Gyp- 
feous Alabafter. 4thly. Selenites, properly *fo 
called. 5thly. A Gypfeous Spar, frequently found 
adhering to the Tides of veins in mountains, parti¬ 
cularly thofe inclofing the ores of metals. All 
thefe fubflances when chemically examined, ex¬ 
hibit precifely the fame phenomena, and are, in 
reality, nothing but different cryftallizations of 
the fame compound fait. * 
Befides the gypfums, there is another fubftance, 
which though claffed by naturalifts with earthy 
bodies, is neverthelefs a compound fait, and, 
like the gypfums, has a natural tendency to 
cryftallize or fhoot into maffes of regular forms. 
This fubftance ftrongly promotes the fufion of 
earthy fubflances, particularly thefe of the cal¬ 
careous and argillaceous kind, and on this account 
is generally denominated a fluor or flux, but, 
* La nature fournit beaucoup de matlere faline de meme 
efpece que celle dont nous parlons (viz. felenite) mais 
qui a differentes formes, & a laquelle les naturaliftes one 
donne differentes noms comme gypfe ou miroir d’Ane, 
pierre a platre, albatre, fpath gypfeux, See. mais tomes 
ces matieres font un feul & meme fel, & nous les confide- 
rerons comme telles. 
Chvmie Experimentale Sc Raifonee, par 
Mr. Baume, Tom. I. p. 154. 
in 
