Coherer, self-recovering types of, 128, 163
„, systematic study of, 120
Comparator, Electric, 282
Conductivity hysteresis, exhibited by single and multiple contacts, 241
Conductivity Recorder, 169, 230
Conductivity variation, effect of allotropic change on, 142
„„,„„continuous radiation on, 175, 189
„„,„„cyclic variation of, E. M. F. on, 240
„„,„„external changes on, 244
„„, relation of, with intensity of radiation, 178
Continuous electric radiation, effect of, on Ag′ 203
„stimulation, effect of, on tin-cell, 202, 203
„„,„„, on Silver cell, 202
„„,„„, on Ni-cell, 202, 203
„„, reversal produced by, 204, 215
„visible radiation, effect of, on AgBr, 203
Crescograph, High Magnification, 347
„„„, Balanced form of, 351
„„„, records of growth by, 349
„, Magnetic, 357
„„, Demonstration form of, 358
Crystals. different system, for electric polarisation, 95
"Dark Cross", electro magnetic, 114
„„,„„ concentric wood for, 114
„„,„„ minerals for, 115
Decoherence, phenomenon of, 128
Desmodium gyrans, effects of, stimulants and depressants on pulsation of, 373
Dextrose and levulose, electric analogues of, 109
Double absorption and double conductivity, exhibited by chrysotile, 73; epidote, 74; nemalite, 73
Double conductivity, its relation to double absorption, 73
Double refraction of electric ray, 95
Efficiency, photosynthetic of green leaves, 336
Electric radiation, electromotive variation induced by, 183
Electric radiation and mechanical stimulation, similarity of effects of, 204
Electric radiation and visible radiation, similarity of effects of, 187
Electric rays, complete polarisation of by, book, 99; chrysotile, 98; epidote, 9; jute cell, 17; nemalite, 9; serpentine, 16
Electric rays, polarisation, of by books, 99; crystals, 8, 95; gratings, 2; human hair, 96; strained dielectric, 20; vegetable fibres, 17
Electric rays, lens for parallel beams of, 5
„„, partial reflection of, by air-film, 53
„„, partial transmission of, by air film, 53
„„, total reflection of, 44
