and a concurrence of either
natural or artificial heat.

Thirdly, that by several bodies (as Salts and Metals both in Water and in
the air, and by several kinds of sublimations in the Air) actuated and
guided with a congruous heat, there may be produc'd several kinds of bodies
as curiously, if not of a more compos'd Figure; several kinds of rising or
Ebulliating Figures seem to manifest; as witness the shooting in the
Rectification of spirits of _Urine_, _Hart-horn_, _Bloud_, &c. witness also
the curious branches of evaporated dissolutions, some of them against the
sides of the containing Jar: others standing up, or growing an end, out of
the bottom, of which I have taken notice of a very great variety. But above
all the rest, it is a very pretty kind of Germination which is afforded us
in the Silver Tree, the manner of making which with Mercury and Silver, is
well known to the Chymists, in which there is an Ebullition or Germination,
very much like this of Mushroms, if I have been rightly inform'd of it.

Fourthly, I have very often taken notice of, and also observ'd with a
_Microscope_, certain excrescencies or Ebullitions in the snuff of a
Candle, which, partly from the sticking of the smoaky particles as they are
carryed upwards by the current of the rarify'd Air and flame, and partly
also from a kind of Germination or Ebullition of some actuated unctuous
parts which creep along and filter through some small string of the Week,
are formed into pretty round and uniform heads, very much resembling the
form of hooded Mushroms, which, being by any means expos'd to the fresh
Air, or that air which encompasses the flame, they are presently lick'd up
and devour'd by it, and vanish.

The reason of which _Phaenomenon_ seems to me, to be no other then this:

That when a convenient thread of the Week is so bent out by the sides of
the snuff that are about half an Inch or more, remov'd above the bottom, or
lowest part of the flame, and that this part be wholly included in the
flame; the Oyl (for the reason of filtration, which I have elsewhere
rendred) being continualy driven up the snuff is driven likewise into this
ragged bended-end, and this being remov'd a good distance, as half an Inch
or more, above the bottom of the flame, the parts of the air that passes by
it, are already, almost satiated with the dissolution of the boiling
unctuous steams that issued out below, and therefore are not onely glutted,
that is, can disso