Vitrum Antimonii, that is ſaid to be purer than ordinary, may be made of the Regulus of the ſame Mineral, in whoſe preparation you know a great part of the Antimonial Sulphur is ſeparated and left among the Scoriæ; ſo Glaſs of Antimony made without additament, may eaſily, as experience has inform'd us, be in part reduc'd to a Regulus, (a Body not reckon'd amongſt Electrical ones.) And that you may not think, that 'tis onely ſome peculiar and fixt part of the Antimony that is capable of Vitrification, let me aſſure you, that even with the other part that is wont to flye away, (namely the Flowers) an Antimonial Glaſs may without an addition of other Ingredients be made.
EXPER. IV.
FOurthly, The mention of a Vitrified Body brings into my mind, that I more than once made ſome Glaſs of Lead per ſe, (which
I
