in the Paper, and Alcalizate ones are too Unctuous, or so apt to draw
Moisture from the Air, that they keep the Paper from drying well) yet the
former Part succeeded well enough; the Blew and Red being Conspicuous
enough to afford a surprizing Spectacle to those, I acquaint not with (what
I willingly allow you to call) the _Trick_.

[18] _Herbarists_ are wont to call this Plant _Cyanus vulgaris minor_.

_Annotation upon the one and twentieth Experiment._

But lest you should be tempted to think (_Pyrophilus_) that Volatile or
Alcalizate Salts change Blews into Green, rather upon the score of the
easie Transition of the former Colour into the latter, than upon the
account of the Texture, wherein most Vegetables, that afford a Blew, seem,
though otherwise differing, to be Allied, I will add, that when I purposely
dissolv'd Blew Vitriol in fair Water, and thereby imbu'd sufficiently that
Liquor with that Colour, a Lixiviate Liquor, and a Urinous Salt being
Copiously pour'd upon distinct Parcels of it, did each of them, though
perhaps with some Difference, turn the Liquor not Green, but of a deep
Yellowish Colour, almost like that of Yellow Oker, which Colour the
Precipitated Corpuscles retain'd, when they had Leisurely subsided to the
Bottom. What this Precipitated Substance is, it is not needfull now to
Enquire in this place, and in another, I have shown you, that
notwithstanding its Colour, and its being Obtainable from an Acid
_Menstruum_ by the help of Salt of Tartar, it is yet far enough from being
the true Sulphur of Vitriol.

_EXPERIMENT XXII._

Our next Experiment (_Pyrophilus_) will perhaps seem to be of a contrary