_Cold_
may be suddenly produced without the help of _Snow_, _Ice_, _Haile_,
_Wind_, or _Niter_, and that at any time of the year._

This subject will it self, 'tis presumed, without any other _Preamble_,
speak the Cause, why this present Paper is publish't at this (unusual) time
of the Month: though, by the by, it may not be amiss to add on this
occasion, that the Publisher of these _Tracts_ never meant so to confine
himself to a _Set_ time, as not to retain the Liberty of taking any other,
when there is occasion. And there being one given him, before another Month
is come in, he does without any scruple or delay comply therewith,
presenting the Curious with an Experiment which he thinks is both
seasonable, and will not be unwellcome to them; furnish't out of the Ample
Magazin of that Philosophical Benefactor, the Noble Mr. _Boyle_; Concerning
which, thus much is further thought requisite to intimate on this occasion,
that it, and some others of the same Gentlemans, that have been, and may
be, mentioned in the _Transactions_, belong to certain Treatises, the
Author hath lying by him; but that yet he denys not {256} to communicate
them to his Friends, and to allow them to dispose thereof, upon a hope,
that equitable Readers will be ready to excuse, if hereafter they should
appear also in the Treatises they belong to, since he consents to this
Anticipation, but to comply with those, that think the imparting of real
and practical Experiments, may do the Publick some Service, by exciteing
and assisting mens Curiosity in the interim.

As for the Experiment, you saw the other day at my Lodgings, though it
belongs to some Papers about _Cold_, that (you know) could not be
Publish't, when the rest of the _History_ came forth, and therefore was
reserved for the next _Edition_ of that Book; yet the Weather having been
of late very hot, and threatning to continue so, I presume, that to give
you here in compliance with your Curiosity an Account of the Main and
Practical part of the Experiment, may enable you to gratify not onely the
Curious among your Friends, but those of the Delicate, that are content to
purchase a Coolness of Drinks at a somewhat chargeable rate.

You may remember, that the Spring before the last, I shew'd you a
particular Account of a way, wherein by a certain substance obtain'd from
_Sal Armoniack_, I could presently produce a considerable degree of _Cold_,
and that with odd Circumstances, without the help of