ugh it may appear in a Glass, where it has a good Thickness, to be of a
deep Red, yet if you shake the Glass, or pour a few drops on a sheet of
White Paper, spreading them on it with your Finger, the Balsom that falls
back along the sides of the Glass, and that which stains the Paper, will
appear Yellow, not Red. And there are divers Tinctures, such as that of
Amber made with Spirit of Wine, (to name now no more) that will appear
either Yellow or Red, according as the Vessels that they fill, are Slender
or Broad.

_EXPERIMENT XXXIII._

But to proceed to the Experiments I was about to deliver; _First_; Oyl or
Spirit of Turpentine, though clear as fair Water, being Digested upon the
purely White Sugar of Lead, has, in a short time, afforded us a high Red
Tincture, that some Artists are pleas'd to call the Balsom of _Saturn_,
which they very much (and probably not altogether without cause) extoll as
an excellent Medicine in divers Outward affections.

_EXPERIMENT XXXIV._

_Next_, take of common Brimstone finely powdred five Ounces, of
Sal-Armoniack likewise pulveriz'd an equal weight, of beaten Quick-lime six
Ounces, mix these Powders exquisitely, and Distill them through a Retort
plac'd in Sand by degrees of Fire, giving at length as intense a Heat as
you well can in Sand, there will come over (if you have wrought well) a
Volatile Tincture of Sulphur, which may probably prove an excellent
Medicine, and should have been mention'd among the other Preparations of
Sulphur, which we have elsewhere imparted to you, but that it is very
pertinent to our present Subject, The change of Colours. For though none of
the Ingredients be Red, the Distill'd Liquor will be so: and this Liquor if
it be well Drawn, will upon a little Agitation of the Vial first unstop'd
(especially if it be held in a Warmer hand) lend forth a copious Fume, not
Red, like that of Nitre, but White; And sometimes this Liquor may be so
Drawn, that I remember, not long since, I took pleasure to observe in a
parcel of it, that Ingredients not Red, did not only yield by Distillation
a Volatile Spirit that was Red, but though that Liquor did upon the bare
opening of the Bottle it was kept in, drive us away with the plenty and
sulphureous sent of a White steam which it sent forth, yet the Liquor it
self being touch'd by our Fingers, did immediately Dye them Black.

_EXPERIMENT XXXV._

The third and _last_ Experiment I shall now mention to shew, how prone
Bodies