Controverfies that perplex Mankind, depending on the doubtful and uncertain Ufe of Words, or (which is the fame) indetermined Ideas, which they are made to stand for, I have made choice of these Terms to fig nify, 1. Some immediate Object of the Mind; which it perceives and has before it, diftinct from the Sound it ufes as a Sign of it. 2. That this Idea, thus deiermined, i. e. which the Mind has in itself, and knows, and fees there, be determined without any Change to that Name, and that Name determined to that precife Idea. If Men had fuch determined Ideas in their Enquiries and Difcourfes, they would both difcern how far their own Enquiries and Difcourfes went, and avoid the greatest Part of the Disputes and Wranglings they have with others.

Befides this, the Bookfeller will think it neceffary I should advertise the Reader, that there is an Addition of two Chapters wholly new; the one of the Affociation of Ideas, the other of Enthusiasm. These, with fome other larger Additions never before printed, he has engaged to print by themselves after the fame Manner, and for the fame Purpose, as was done when this Effay had the fecond Impreffion.

In the fixth Edition, there is very little added or altered; the greatest Part of what is new, is contained in the 21st Chapter of the second Book, which any one, if he thinks it worth while, may, with a very little Labour, transcribe into the Margin of the former Edition.

VOL. I.

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