t 2 5+] 
Shape, and the fmooth Sides which Gornijh 'Dia- 
monds make in Incruftations, and ali after and fe- 
condary Concretions. This fparry Liquor is ftiff and 
fluggifh, and apt to harden j but it is a Liquor how- 
ever, before it becomes a Stone. Nor is this 
Opinion Angular, but adopted by many of the Mo- 
derns as well as Antients. Tliny ( 4 ), from the Re- 
femblance that Cryftals have to Water, carried this 
Hypotheiis much too far, and thought them to be 
nothing more than Water congealed by exceflive 
Cold j and Diodorus efteems them no better than a 
Concretion of pure Water, affigning however a dif- 
ferent Caufe, concluding them harden'd by a divine 
Heat. Agricola makes the Succits lapidefcens the 
original Matter of which Stones are formed, fome 
by the Heat, others by the Cold (7) they meet with, 
during the State of Fluidity (6). Mr. Geoff’roy’s Hy- 
pothefis fuppofes Cryftal to be formed of thin 1 
equable Plates, that Water is the Vehicle of cry-^ 
ftalline Parts $ and when thofe Parts meet together 
in any Quantities, the Water eafily evaporating leaves 
the Cryftals to form themfelves into hard, pellucid” 
Bodies. Mr. Boyles Opinion was, that thefe Bodies 
were originally in a fluid State (7). ' / 
■ . • J" i n *i ■ ‘j j };. L 
. — ■ ) ■> 
( 4 ) Lib. 37 . t. 2 . 
( 5 ) C( Utroque enim modo effici potefl Lapis? Ag. de Ort. Subt. 
Lib. 4 . Bafif. Edit. p. 57 . 
( 6 ) lb. p. 56 . 
( 7 ) See Boerhaave’s Theory of Chemiftry, by Shaw, Not. 120 . 
Sect. 
