(^57) 
in common water* Bu£this is eafily refolv'd by what I 
before fuggefted ; as alfo by an eafie obvious Experi- 
ment, which may at any feafon in any Plant be readily pro- 
ved* Take whst't Wood or Plant you pleafe,burn it green; 
the Salt, being extrafted out of the allies, will, according 
to the different degrees of fire wher eunto it ILall fuccefs- 
fively be expofed, varioufly influence the Mercurial folu- 
tion, the feveralPraecipitats differing nolefsfrom each o? 
ther, than when made with the Saks of different Plants. 
This is alfo moff evident in !r/<r^4r, which, the lefs and 
more gently it is calcined, the more Sale it yields; and on 
the contrary, a much fmaller proportion, if fuddenly and 
with the higheft degrees of heat. That which isprepar'd 
by the former method , is mild and gentle, its Taft: ap- 
proaching fomewhat towards that of Acids 5 whereas the 
other, which hath pafs'd through the violence of fire, hath 
not the leaft affinity therewith, and can almoft as little be 
endured by the Tongue as a live coal of aftual fire. And 
there being very many degrees of heat, whereuntothe Tar- 
tar may be fucceffively expofed according to the faid de« 
grees, the manner of applying it, fpace of time, and fub- 
ftances employed in its calcination ; the Refult will be 
different, and produce different effefts : And the very fame 
fort of Tartar will oftentimes become fenfibly different up* 
on thefe methods of procedure, and produce niofl: of the 
appearances mentioned by tachenm. And fometimes fe- 
veral parcels of Tir^^r, which feem to our Taft and Eye 
calcined to the fame degree 5 yet the Operations in nice 
Experiments are frequently various. And to me it doth 
not feem fo very wonderful, that many Concrets do re- 
ally differ , which to the Senfes appear fimple and uniform; 
of which many caufes may be affigned. A great number^ 
and variety of Inftances might be here introduced to clear 
this truth , if it were not already fufficiently known and 
believed. 
But 
