A COMPENDIOUS SYSTEM O F Natural Philofophy: With NOTES, Containing the MATHEMATICAL DEMONSTRATIONS, AND Some Occafional REMARKS. In FOUR PART S. VOL. I. By J. ROWNING, M. A. LONDON, Printed for SAM. HARDING, on the Pavement in 01-10-34 MA Bowes 9-8-31 24597. 2 vol. THE PREFACE. IT being an ufual Complaint with thofe who are unacquainted with Geometry, that they are difcouraged by the Mathematical Demonftrations, from perufing Books of Natural Philosophy; I apprehended that fome Papers I had drawn up for the Ufe of my Pupils in the Univerfity, would not be altogether unacceptable, if published in fuch Form, that the Propofitions, or Substance of the Book, might be read without Interruption from the Demonftrations. I have therefore in the following Treatife laid down the faid Propofitions, and endeavoured to prove them in a familiar and eafy Manner, without Geometry, by way of Text: And for the fake of those a 2 who who are fkilled in that Science, have added the Demonftrations, with fome occafional Remarks, by way of Notes. And whereas the Writers on this Sub- ject have appropriated to themfelves a Stile too technical for Beginners, I have, in hopes of being more easily un- derstood, fometimes chofe a plainer and more popular Way of Expreffion, though perhaps not always fo accurate. In the Introduction to the firft Part, Notice is taken of the Method of Philo- fophifing made Ufe of by Des Cartes, and others before him, fo far as the Defign of this Compendium required. I fhall add here a few Confiderations relating to the Method which prevails In the prefent Method of Philofophi- fing, all Matter is confidered (with re- |