The evolution of forces

action of light apatite atoms become calorific cause centimetres CHAPTER charge chemical consequently conservation of energy contrary dark defined definite diamonds difficult dissociation of matter ebonite electric waves electrified electroscope elements emission emitted equilibrium ether evidently existence experiments explain exposure fact field figure finally find first fixed flow fluid fluorite forms of energy glass Hertz Hertzian waves incandescent indefinitely inertia influence infra-red insolation intra-atomic energy invisible kilogrammes kilogrammetres kinetic energy lamp leucophane lines of force liquid luminous magnet magnitude manifestations mechanics metal metres millimetre movement observed obtained opaque body particles pass phenomena phenomenon phorescence phos phosphorescence phosphorescent by heat physicists placed possess principle produced properties quantity of electricity radiations radio-active radium rays researches scientific screen shine simple space sparks substances suffices sufficiently sulphide sulphide of calcium sulphide of zinc temperature tension theory thick tion transformation transparent tricity ultra-violet universe velocity vibrations visible wave-length zinc