For the better understanding this Paper, it is necessary to know, that Father Beccaria uses a large Chain, suspended by Silk Lines, for the Purpose of a Prime Conductor; and that his Machine for turning the Glass Globe, is so contriv’d, as that he can on occasion readily isolate it, (i.e. place it on Glass or Wax) together with the Person that works it. When the Communication is thus cut off, between the Earth and the Chain, and also between the Earth and the Machine, he observes, that the Globe being turn’d, both the Chain and the Machine show Signs of Electricity; and as these Signs, when examined, appear to be different in the Chain and in the Machine; and the Globe having, as he supposes, drawn from the Machine Part of its natural or common Quantity of Electricity, and given it to the Chain; he calls the Electricity appearing in the Chain, Electricity by Excess; and the Electricity appearing in the Machine, Electricity by Defect; which answer to our Terms, of positive and negative Electricity, or Electricity plus and minus. And thus his Expressions, Electrifying by the Chain, and Electrifying by the Machine, are to be understood, Electrifying positively, and Electrifying negatively.