Rare Books

Philosophical essays in three parts : containing I. An enquiry into the nature and properties of the electrical fluid, in order to explain ... Sir Isaac Newton's doctrine of a subtile medium or æther, II. A dissertation on the nature of fire ..., III. A miscellaneous discourse, wherein the forementioned active principle is shewn to be the only probable mechanical cause of motion, cohesion, gravity, magnetism, and other phænomena of nature : to which is subjoin'd ... a clear and concise account of the variation of the magnetic needle or mariner's compass