( 274 ) 
ways be an Acid, as is evident by Chymical Experi- 
ments, and the very lade of faline Crydals, IVater 
and Earth. Crydailifation, as far as can be guefs’d by 
Chymical Obfervations, is perform’d thus: Particles 
of certain determined Shapes, fwiraming in a Fluid of a 
certain Confidence, are, either by the intedine Motion 
of this Fluid, ,or by the Motion of the Air, fupoofed 
to circulate perpetually through its Pores, or by feme 
other Caufe, brought together, fo as to form larger Bo- 
dies of a Figure proportionable both to the Degree of 
tmpulfion, and the primitive Shape of the condituent 
Parts, or determined by thefe two Things. This Aft 
of Crydailifation, though uniform-, as- to the Union 
of Particles confider’d in itfelf, .is yet obferved to be' 
very different, and to have different Effete, with re- 
fped to the different Nature of the Fluid, in which 
Cryflals are formed,, and the Degree of Perfection, to 
which they ar-e brought. Our Author mentions fix dif- 
ferent Kinds of Cryftallifation, each of which, he in- 
tends to explain more fully in his larger Work. The 
fird Sort of Cryftallifation, which hath been examin’d 
with a great deal of Accuracy by Gulte ItHtnus , is per- 
formed in an aqueous Fluid, wherein faline Particles- 
have been dilfglved, boil’d to a certain Degree of Con- 
fidence, commonly that of a thin E elite u la covering* 
its Surface. This aqueous Fluid mud be afterwards 
repos d. in a cool -Place, that the faline Particles contain'd ' 
in, it may form themfelves into Crydals, which is done 
in more or lefsTime, according to the different Nature 
both of the Fluid and Salts. All Chymical Prepara- 
tions of Salts, the Origin of precious Stones, and ©f the 
Crydal itfelf, belong to this firftKind. Our Author 
oblerved, that in the Spiritas aperitivus Glauberi , < 
(which is a Preparation of Oner. Clave ll. p. ii. & Sal* 
Armon. 
