THE STEAM ENGINE, A SUBJECT OF POPULAR INTEREST. — THE OBJECT OF THIS WORK. — DISPUTES RESPECTING THE INVENTION. — HERO. — DE GARAY. — DE CAUS. — BRANCA. — MARQUIS OF WORCESTER. — PHYSICAL PRINCIPLES. — ELASTIC AND INELASTIC FLUIDS. — THEIR PROPERTIES. — APPLICATION OF THESE PRINCIPLES TO THE ENGINES OF HERO, DE CAUS, AND LORD WORCESTER. — SIR SAMUEL MORLAND. — PAPIN. — A...