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Respect, and that is, to comprise the Whole in so small a Compass, as to put them to very little Expence, either of Time or Money, to acquire a very confderable Knowledge of all the principal Branches of this most valuable and delightful Science ; which by this Means will be rendered of great Service to improve the Mind, and embellish it; but without the Asistance of such a Treatise, it cannot be regarded as any thing more than a polite and tational Amusement.

And not only such as attend the Lečtures, but any Gentleman or Lady, who is happy enough to have a Taste for Knowledge of the best Sort, will find this small Tratt give them as little Trouble in the Pursuit and Acquistion of it, and at the same time entertain their with as great a Variety and Novelty as they can possibly expect. When they understand what they here find (for which nothing more than a common Capacity and a little Attention is necessary) they may have Recourse to Books of a higher Class; but, if they have not Mathematical


Learning, they must be content to underfand Philosophy in that Way only which is bere taught, viz. By observing the Phænomena of Nature, and deducing from thence their Caufes, which are rendered general by a juft. Method of Reasoning, and proved to be real by Experiments. And this is fufficient for Mankind in general.

I shall not here say any thing to recommend the Study of this Science, having already done that in another Piece*. And that nothing may be wanting to facilitate the Reader's Progress in Philosophical Enquiries, I have embellished and illustrated the Whole by fix Copper Plates, representing the principal Experiments in each of the Lectures; and also added a copious Index of all the principal Matters, and accented all the Words for rightly pronouncing them. Also all hard or technical Words are thoroughly explained; and I have taken all the Care and Precaution I posibly could, to remove every thing that might in the least tend to retard the Reader, or render this noble and divine Science less amiable to his View.


To conclude, I must advertise the Reader; that those Propostions, which admit of or require Mathematical Demonstration, are bere put into Italics, and may be found so demonstrated in my Philofophia Britannica, a Second Edition of which has been lately published in Tbree Volumes Ostavo.


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