And in the passage of
the Liquor from one of these Colours to the other, you may observe, if you
consider it attentively, divers other less noted Colours belonging to Red,
to which it is not easie to give Names; especially considering how much the
proportion of the Decoction to the fair Water, and the strength of that
Decoction, together with that of the trajected Light and other
Circumstances, may vary the Phaenomena of this Experiment. For the
convenienter making whereof, we use instead of a Vial, any slender Pipe of
Glass of about a foot or more in length, and about the thickness of a mans
little finger; For, if leaving one end of this Pipe open, you Seal up the
other Hermetically, (or at least stop it exquisitely with a Cork well
fitted to it, and over-laid with hard Sealing Wax melted, and rubb'd upon
it;) you shall have a Glass, wherein may be observ'd the Variations of the
Colours of Liquors much better than in large Vials, and wherein Experiments
of this Nature may be well made with very small quantities of Liquor. And
if you please, you may in this Pipe produce variety of Colours in the
various parts of the Liquor, and keep them swimming upon one another
unmix'd for a good while. And some have marveil'd to see, what variety of
Colours we have sometimes (but I confess rather by chance than skill)
produc'd in those Glasses, by the bare infusion of Brazil, variously
diluted with fair Water, and alter'd by the Infusion of several Chymical
Spirits and other Saline Liquors devoid themselves of Colour, and when the
whole Liquor is reduc'd to an Uniform degree of Colour, I have taken
pleasure to make that very Liquor seem to be of Colours gradually
differing, by filling with it Glasses of a Conical figure, (whether the
Glass have its basis in the ordinary position, or turn'd upwards.
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