t *-s* j 
There arc fcveral Sorts of thefe fparry Productions, 
'which are carefully to be diftinguifh’d from each 
otherj but they may all be confidered, flrfl:, with 
regard to their original State, or what they have 
been} and, in the next Place, as to what they now 
are, that is, as to Form, Size, Colour, Hardnefs, 
Texture of Parts, and Dire&ion of their Shoots in 
the Mines or Quarries. Thefe Particulars, feparatcly 
difejafled, may poflibly lead ,us to fcveral probable 
Conje&ures concerning the Original and moll diflin- 
guilhing Properties of thefe Bodies, fuch as may af- 
ford fome Light to this perplexed and intricate 
Subject. 
S E C T. I. 
That all Spar has been, at one time or other, in a. 
State of Fluidity* may be maintained, I think, with great 
Rcafon-,. as well a $ fuppart^d by; the Authority of 
fome of the mod eminent Naturalifts (2). In fome 
Spars are found Straws, and other light Bodies} and 
we may therefore as juftly- conclude them to have 
been once fluid,, as the Amber that inclofes the Bee. 
In fome Stones, whereon were fparry Concretions, 
■ -1 . ■ :: ; . - . . i'J \ 1 ■. * 
and terrene than that of the common Spar, than to any effential and 
radical Difference in the Principia of thefe Bodies, There is in 
“all Spar more or left 'of' CryfVnl.” Wdodviard’s Nat. Hi ft. Fojftls , 158.] 
For many Spars that are, which are opaqua, and yet in the fame 
hexagonal Fortn as Cryftals} vyh^nce jt appears, that Spar andCryftal 
do npt differ in SubfUnce andNature, but inTranfparency, Colour, 
and different Dej/rees'df Purit/i Spars much the fame with Cryft 
t{ tals, fays Dr. P/or, Oxf. p. 9 8. §. 52.” Atid Boetius doubts nor, 
but they {viz. Spars) are of the fame Matter with Gems, ib. §. 5 3. 
(2) iVoodward’s Catal. of Foff. Vol. 1. p. 151, and 157. No. 78. 
alibiqu e pajjim. 
' /3td ' I i 2 Dr. - 
