( try ) 
Armon. p. i.) after a Year’s Handing, form’d themfelves 
artificial Cryflals, in Figure and Pellucidity exadly 
like the true lexangular Cryftal, and pointed on both' 
Sides. The fecond Kind of Cryflallifation differs from 
the firft only in this, that it is performed not in a thin, 
pellucid, aqueous Fluid, but between thick, mineral, 
or metallical Mixtures, corroded by acid Salts in the 
Bowels of the Earth. The third Sort is of a middle 
Kind between the firft, and a Coagulation, viz,, when 
the Fluid, in which Salts have been diffolved, is, by 
degrees, entirely evaporated. This Way of Cryftalli- 
fation is more proper for difcovering the primitive Shapes 
offaline Particles. Our Author hath examined feveral 
Salts, both Mineral and Vegetable, and feveral Chymi- 
cal Preparations after this Manner, and hath given us 
their Figures, as they appear’d to him under a good 
Microfcopef in two Tables annexed to this Treatrfe. 
The fourth Sort of Cryflallifation is perform ’din a ftill 
thinner Fluid than Water is, or in the Air j the Subli- 
mations of the Chymifts, the Diftillation of volatile 
Salts j Snow, whofe wonderful Figure hath been thought 
worthy the Amufement of feveral eminent Men ; Hii), 
which is again of very different Shapes- Frofl, and 
that admirable Variety of Trees, Landfkips, and other 
inimitable Figures, which, in veryfrofty Weather, ap- 
pear upon Glafs-Windows, or other pellucid Bodies, 
muft be all reduced to this fourth Sort. The fifth Sort 
of Cryflallifation is perform’d upon the Surface of 'a 
thicker Fluid, as Water, between that and a thinner 
one, as Air ^ of this Kind is chiefly Ice. Thefixth and 
laft Sort of Cryflallifation, mention’d by our Author 
differs from all the former, in that it. is perform’d nei- 
ther by the Rife of Vapours, nor by the repofing of any 
Fluid, but ory the. contrary in a Fluid, which°is in a 
perpetual Motion. .That Sort of icy Concretions, which 
is. 
