of Salts and Saline Subjlances . 7 
Our Eyes are continually accuilomed to 
fee the Productions of Nature when finifh- 
ed, or brought a confiderable Way to¬ 
wards itj and what contemplative Man 
can behold them without Admiration and 
Delight! but in thefe. Experiments we are 
enabled, by the Afiiftance of Glaffes, to,view 
her actually at Work, forming under our 
Ey es, and in a few Minutes, Bodies fa ejc- 
quifitely beautiful that nothing but feeing 
can give any juft Idea of them 5 and. tbit 
too with fuch a Variety, as to the. Plan 
and Fafhion of each Kind, as is abfolutely 
unconceivable. 
Defcriptions of the Subjects here treated 
of would be unintelligible without the Af- 
fiftance of Drawings. Drawings therefore 
.have been made, and Copper Plates en¬ 
graven, at no fmall Expence, of the 
rent Configurations hereafter mentioned: 
which, though greatly deficient in .Beauty 
and Regularity, if compared with the .Ori¬ 
ginals, and only pretending to give fuch a ge¬ 
neral Refemblance as may diftinguiib each 
Kind from other, will J tis hoped pro.v,e fa- 
tisfaCtory to thofe who fhall pleafe .to. re¬ 
peat the Experiments after me.: for how¬ 
ever ftrange they may appear, .they: are 
no fanciful Rep refen tations produced by the 
Strength of Imagination,-. nor are they 
taken haftily from one or two Trials., hut 
truely fhew what generally prefented . in 
§4 - great 
