[497] 
now though we muft perhaps acknowledge in fome of 
tbefe Inftances, thu thQpd.Tticn]ar Semzn£}l principle fpe- 
cifie^ thele new aquif d parts; and determinately makes 
them Mineral ov MetalJicJ{ of the name and nature of 
the Matrix into which they are received, yet this is 
certain I the addition of rveight is owing to a Sub/lance 
communicated by the jiir, Injiances of this nature con- 
cerning the ^r(?^^/^ of Lead, Iron, Tin, Silver and Gold 
with the Increafe of other bodies are fuccindly colleded 
and with his wonted Sagacity remarkt on by Mr Boyle in his 
trads on that fubjedl. So that the Increafe and attraBive 
power ol Solids is a Theme already fairly cu'tivatedand 
put beyond queftion ; But that //^/V// fuch as fee m SatU'-^ 
rated with their own moyjlure Ihould neverthe'efs imbibe 
more from the Air is not mentioned by any Author I 
knowof, except the aforefaid L^^rw^^ perfon^ who in his 
Trail of Aerial magnets advices tryals upon the liquidpre- 
parations of Fttriol: I have heard indeed fome Druggifts 
have accidentally taken notice of this encreafe in Ojl of 
Vitriol, ( and perhaps have improved it to their own gain 
though to the detriment of the buyeFj ) but the obferva- 
tion never was profecuted with any method or certain ac- 
count how much the faid /i^^trr^^^y^ 2p^?j, and what the fub- 
fiance, gaind. 
The Induftrious Chymift Mr. White our Univerfity O- 
perator, having a Viol of that liquor unfiopt and conftant- 
ly running over^ firft gave occafion to the following notes: 
but fince from thence no true eftimate of the juft Increafe 
could be CO leded, I hope it may not prove altogether un- 
grateful to the Curious to give yoo, in anfwer to your 
requeft, what has occur'dmore particularly on this fub- 
jeit, and I do it the more readily becaufe the ^ S, have 
thought it a thing not to little for the prels. 
On the ninth of M?. 1683. ThreeUrams of Oyloi Vitriol 
fo far Dephlegm'd as to burn or Corrode a ftrong pack- 
I 2 thred 
