Conservation of Energy, Its Relation to Possibility of Perpetual Motion (See Table of Contents), 5 Considered with Reference to Perpetual Motion, 269 Proof and Illustration of, 200 Anticipated by Newton, Galileo, Huyghens and Descartes, 272 Copland, Robert, His "Improved Method of Gaining Power", 140 Cunningham, George, His "Mercurial Pneumatic Device", 157 "Darius Green and His Flying Machine", 16 Desagulier, Rev. J. T., Proposition on the Balance, 47 Article of, Concerning the Device of Marquis of Worcester and the Orffyrean Wheel, 222 Dircks, Henry, Title Page Mention, 3 His Books Mentioned, 7 Comments by Author on His Works, 8 Information Furnished by, Rearranged, 9 His Classification of Devices, 19 His "Life, Times and Scientific Labors of the Second Marquis of Worcester", 213 Excerpt from, 228 His Statement Concerning Arguments For and Against the Possibility of Perpetual Motion, 270 Arguments by Others For and Against the Possibility of Perpetual Motion, Published by Dircks, Copied in This Work, 274 Eaton's Perpetual Siphon, 145 "Ed. Vocis Rationis," His Device, 78 Ellis, George Henry (See Rathen & Ellis). Energy (See Momentum and Energy). Energy, Conservation of (See Conservation of Energy). Energy and Heat Convertible and Commensurable, 262 Energy Defined, Explained and Distinguished from Momentum, 203 Enbom and Anderson's Pump, 76 Explanation by Author of Failure of Hydraulic and Hydro-Mechanical Devices, 112 of the Failure of Pneumatic, Siphon and Hydro-Pneumatic Devices, 159 of the Failure of Momentum and Energy Devices, 206 of Failure of Wheels and Weights Devices, 61 Failures (See Explanation of Failures). Ferguson, James; "Peasant Boy Philosopher," His Device, 43 Fontana, P. Gregorio, Notice of; His Arguments on the Impossibility of Perpetual Motion, 306 Foot-Pound, Defined and Explained, 265 Furman, George H., "A New and Improved Motor," U. S. Patent, 36