elude, that there were two differing natures, both in fait 
and metals. This lead me to the confideration of heat, 
and cold, of the properties of Light, and of the Sun. 
But nothing has more taken up my though ts,and engaged 
iriy contemplation, then that of light : of this I may per- 
haps, fome time fpeak at large. The nature of water I 
find to be cold^ and as there is an Univerlal cold, fo 
there muft be an Univerfal warmth : by vertue of thefe 
two, all things are generated ; the Sperm of the Earth it 
felf, is in the water. There is nothing comes neerer the 
nature ofwater, then fait, becaule that is firfl generated ^ | 
in it, and doeseafieft diflblve again there. I have alfo n 
found, that becaufe under ground there isa conftant de- 
gree of heat, therefore thofe falts that are there ge- 
nerated, do maintain a greater degree of naturall heat, 
then fuch falts have, which had their Original aboae 
ground. Alfo becaufe I found a remarkable difference | 
in theleparationoffalts, and in thefolution of Metalls, | 
I fought after the purefl: fait j Which I found to be in Vi- j^^ 
triol, OT Sulphur, having both the fame Minera : but 
fince in this, I found a hot and fiery temper or quality,ia I 
fome other fait, I expelled its contrary. Having often 
perceived Salia Vblatiliay (3 Vrinofa, to produce degrees | 
ofcold, without any Gorrofive dispofition ; it made mo 'k 
fearch, and enquire after, an U mvcri^il frigidumj which I | 
found in Water : but moreover, as foon as a Salt was ijf 
generated there, I perceived it alfo to be warm, or of a | 
luixt Nature, holding both heat and Cold together. In fo | 
much, that I could find no pure Salt, of one fimple na- 
ture : But difcerned, by realbn of an afcending heat, and || 
a defcending cold, we had always a Prsecipitat, which was |i 
for the molt part, alalt, or the Materia Salis^ which i 
firft of all feeoned to become a very fubtile Earth, which i 
in time, as it hapned to be fituated, became a more grofs I 
and confpicuous fait. If this water happen to fall upon | 
a fandy ground, it cannot fiak and reft there, but by a I 
conftant ; 
