C 766 ) ■ 
-colour, hy tranfmutiog them into a Sal (trm$?tUc by the mediation 
of an acid, as jptritof Salt, (pirit of Vitriol^ Alum^ &c. and then 
fubliming them till they be \\ hite,\vill ctafe to rfoubt of this mat* 
ter. The reafon of which change, I prefume, is, becaufe, i hough 
thcfe volatile Salts carry overa vvaiesfomeof the fetid oylwith 
them whileinaftateof vo!atility,yet being thus in a manner fixed, 
the fetid oyl miift necelTarily by force of fire rife firft, leaving the 
fubfequent compound Salt, or Sal armoniac without fmcll^though 
it is ftil la doubt 5 whether the vo'atile Sale is better or vvorfefor 
this labour. 
As to your Poftfcripc concerning fetrefcent Springs, we have 
none near us, there is indeed a Cave fome miles oflf, at the furtheft 
end of which few have been, from the roof of which hang large 
lumps of petrified water, like Icles, fome of them reaching down 
to the ground like pillars, thefe icles are, good Limeftone , as C 
have tried. 
I (ball conclude when I have acquainted yoa with a Spirit of 
Sugar y of which a Diftiller with us haih a quantity ; it feems to be 
therefultof fome anomalous fermentation, it is foftrong that no 
lean isable to fmell at it in an open veffel, without being made al- 
moft breathlefs : neither do I think the perfon that made it, can 
make ic again. If it prove worth that confideration of the Noble 
Mr.JBpy/^jlintreatabrief account of his thoughts concerning it, 
particularly whether it may be ufed internally or no,and whether 
it be a thing ordinary or extraordinary \ for in truth I know not 
what tomakeof it. If it fliould prove Antifcorbutick , I hope 
thofe will retrafl: their opinion^ who deduce the Scurvy from the 
ufe of Sugar. Sir, Tour,&c. 
Po{[fcnpt^ExtraffedoufofDrModgro^'s Lener to Pr. Gilpin. 
THe Spirit of Sugar ^ J^rt mentioned, was drawn from bare 
Sugar-water (whic^ is nothing bur the water wherewith the 
molds, aprons,&c. are Wafliedj fermented with the fcum* And iir 
was fo exceedingly voIatil,that it would not be carried, but loft 
all its force in the carriage, though it was very well flopped. 
Jh Account of fome Books : 
I. Robeni Boyle, Nohitiffirni Angli (jr Soc, Bjgia digniffimi Sccii^ 
OPERA rjRIJ) Geneva, in 40. 1 67 7. 
THe Works of this Noble Author having been already given 
an Accomptof in thcfe tranfaliions^ at the feveral times 
when they came abroad fingly 5 the Publilhcr, upon the looking 
over 
