Virtual velocities, 34. principle of, its history, 137. Vital force, whence derived, 171. Vitality, 194. Vitreous and resinous electricity, 63. Voltaic current, 69. and magnetism, 72. heating effect of, 73. chemical effect of, 74. Water at high level, 24. Watt, 138. Wild’s electro-magnetic machine, 103. Will, 194. Work, definition of, 15. unit of, 15. rise of true conceptions regarding, 138. Yeast-plant, 185. THE END. Transcriber’s Notes Errors in punctuation have been fixed. Page 60: “heterogenous bodies” changed to “heterogeneous bodies” Page 80: “Analagous to this” changed to “Analogous to this” Page 82: “etherial medium” changed to “ethereal medium” Page 157: “without occcasioned” changed to “without occasioned”