C 5° 3 
Having feen feveral Produ&ions of Nature, in 
which one difeovers, that the Figure I have been 
fpeaking of fo remarkably prevails, I was neverthe- 
lefs furprifed, when I found the fame Figure in the 
Sediment of the Water of the Fontaine de Salut. 
I had Jet a confiderable Quantity of the Water of 
the mineral Spring evaporate ; there remained a fhine- 
ing Dud, in which I could diftinguifh nothing. I 
then looked at it through a Microfcope ; and, among 
feveral Cryftals of a lefs regular Figure, I found many 
which were quite regular and well-fhaped, with Six 
Faces, and oblique Angles. Several Perfons, who 
have, at different times, been Eye-witnefies of this 
Sight, have been well fatisfied with it. 
The Waters of this Spring contain no Iron, as it 
is commonly believed. When you put the Tin&ure 
of Galls in ir, it grows neither black nor red : This 
Mixture only turns it a little, and makes it look 
whitifh, after having flood fome Hours. 
When thefe Waters are evaporated by a mild and 
equal Heat, the fmall Cryftals are found fwimming 
on the Surface ; where they join, and form a Film upon 
the Water ; fome of which flicks alfo to the Sides and 
the Bottoms of the Veffel. Thofe Cryftals which are 
formed firft, are inftpid j but thofe which are produced 
towards the End of the Evaporation, are, indeed, of 
the fame Shape, but of a tart and faltifh Tafte. There 
remains yet a little of this Matter, which cannot be 
reduced to very regular Cryftals : It is of a very fharp 
and pungent Savour, but has nothing of the prevail- 
ing Chara&er of Acid or Alkali ; at leaft, it makes no 
fenfible Imprcflion upon blue Paper. 
The 
