Experiment XI.
I gave 2 Grains of that Powder, which had remained fix’d, to the Weight of 15 Grains ([VIII.]) to a sworn and very skilful Essayer of Metals at Amsterdam, to examine it with all possible Accuracy according to the Rules of Art, with Lead. Nothing fix’d remain’d: Therefore in that Powder there was not the least Gold or Silver.
Experiment XII.
The thirteen Grains melted down with the Borax into a Mass growing like Glass (almost vitrified) ([X.]) I gave to a sworn and very skilful Essayer of Metals at Amsterdam, to examine this whole little Mass with the greatest Accuracy, according to the Rules of Art, in Lead. Nothing fix’d remain’d of the whole Mass; so there was no Gold nor Silver in it.
Corollaries.
1. Quicksilver persists in the Fire, retaining its Nature unalterable.
2. Simple, and not separable, into different Parts by Distillation.