to comprize the whole in fo fmall a Compass, as to put them to a very little Expence, either. of Time er Money, to acquire a very confiderable Knowledge of all the principal Branches of this most valuable and delightful Science; which by this Means will be render'd of great Service to improve the Mind, and embellish it; but without Afiftance of fuch a Treatife, it cannot be regarded as any Thing more than a polite and rational Amusement. And not Subscribers only, but any Ġentleman or Lady, who is happy enough to have a Tafte for Knowledge of the best Sort, will find this fmall Tract give them as little Trouble in the Purfuit and Acquifition of it, and at the fame Time entertain them with as great a Variety and Novelty, as they can poffibly 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 Recourfe to Books of a higher Class; but, if they have not Mathematical Learning, Learning, they must be content to underfland Philofophy in that Way only which is bere taught, viz. By obferving the Phenomena of Nature, and deducing from thence their Caufes which are render'd general by just Method of Reasoning, and proved to be by real Experiments. And this is fufficient for Mankind in general. a I shall not here fay 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 Philofophical Enquiries, I have embellish'd and illuftrated the whole by fix Copper Plates, reprefenting the principal Experiments in each of the fix Lectures; and alfo added, a copious Index of all theprin cipal Matters, and accented all the Words for rightly pronouncing them. Alfo all hard (or technical) Words are thoroughly explained; and, to conclude, I have taken all the Care" and Precaution I poffibly could, to remove every Thing that might in the leaft tend to retard the Reader, or render this noble and divine Science less amiable to his View. A Panegyric on the Newtonian Philofophy. To To conclude, 1 must advertise the Reade that thofe Propofitions, which admit of, or require Mathematical Demonstration, are bere put into Italics, and may be found fo demonftrated in my Philofophia Britannica lately publish'd. Thefe are all along denoted by an Afterifm, thus (*) CON SECTION 1. PHYSICS Containing a Defcription of fuch Inftruments, Pre- parations, and Experiments as explain and il- luftrate the Powers of Attraction and Repul- fion; the Properties of natural Bodies, the Principles of Mechanic Arts; Chymical Ope- The Nature of Light explain'd; the Laws of Re- flection and Refraction of Light; the Nature and Effects of Mirrours and Lenfes; the Prif- matic Colours of Light; the Nature of Vision by a Natural and Artificial Eye; of the com- mon Microscope; the Solar Microscope; of The Nature and Properties of Air explain'd; the artificial Production of Air; of the Tranfpa- rency, Elafticity and Gravity of the Air; of Barometers, Thermometers, and Hygrome- ters; the Construction and Ufe of a New Por- table Air Pump; a felect Number of principal Of the various Systems of the World; the Co- pernican or Solar System proved to be the on- ly true one; the fame explain'd at large; the Difpofition, Number, Magnitudes, Motion, and Distances of the Heavenly Bodies; the Nature of Day and Night; the Viciffitude of the Seafons; the Nature of Eclipfes; the The- The Nature of Fluidity and Fluid Bodies ex- plain'd; the Hydroaftic Paradox; the Nature of Sinking and Swimming; the Specific Gravities of Bodies by the Hydroftatic Bal- lance; the Ufe of the Hydrometer; of Aqua- ducts and Fountains; the Theory of Pump- work; Several curious Sorts of Pumps; the Theory of the Tides; Newfham's Water-En- Of Motion and Reft; the Laws of Motion ex- plain'd; of the Compofition and Refolution of Forces; the Nature and Ufe of Pendulums explain'd; a new Pyrometer defcrib'd, to mea- fure the Expanfion of Metals; of the Centers of Magnitude, Motion, and Gravity of the common Center of Gravity in the Syftem of the Heavenly Bodies, the Principles of Me- chanics explained; of the Several Mechanical Powers; the Lever, the Wheel, and Axle, the Pulley, the inclined Plane, the Wedge, |