Metal, electric response in, abnormal, 125 abolition of, by 'poison,' 143 additive effect of superposition of stimulus on, 135 annealing, effect of, on, 101 by method of block, 82, 92 negative variation, 87, 183 depressants, effect of, on, 142 diphasic, 113, 114, 115, 116, 188 enhancement of, after continuous stimulation, 127, 128, 186 fatigue, 118, 119, 120, 121, 185. _See also_ Fatigue maximum effect due to superposition of stimuli, 136 modified, 129 'molecular arrest,' effect of, by 'poison' on, 145 molecular friction, effect of, on, 108, 109 prolongation of recovery by overstrain, 106 by 'poison,' 145 relation between, and stimulus, 134, 135 staircase effect, 122, 186 stimulant, effect of, on, 141 temperature, effect of, on, 111 uniform, 102, 184 Minchin on photo-electric cell, 165 Molecular 'arrest' in metals by 'poison,' 145 friction, 108, 109 model, 107 voltaic cell, 99 Munck on electric response in sensitive plants, 14 Muscle, fatigue in, 38, 39, 40, 42. _See also_ Fatigue prolongation of recovery by 'poison' in, 144 relation between stimulus and response in, 52 staircase effect in, 122 stimulus, effect of superposition of, on, 36 Myograph, 2 Negative variation, response by method of, in metal, 87, 183 in nerve, 9, 183 in plant, 18, 183 Nerve, current of injury in, 7 injured and uninjured contacts corresponding to Cu and Zn in voltaic couple, 8 response in, abnormal, when stale, 124, 187 abolition of, by 'poison,' 139, 189 anaesthetics, effect of, on, 72 by method of negative variation, 9 current of action of, 8 enhancement of, after continuous stimulation, 127 modified, 128 relation between, and stimulus, 52 reversed when stale, 11 uniform, 184 Nomenclature, anomalies of present, 9, 85 Photographic recorder, 11, 22 Plant chamber, 64 electrical response in, abnormal, when stale or dying, 48, 187 abolition of, by high temperature, 32, 64 additive effect of stimulus on, 37 anaesthetics, effect of, on, 30, 73, 74, 75 by method of block, 28 of negative variation, 18, 183 diphasic, 46 fatigue, 20, 39, 40, 41, 42, 43, 57, 185. _See also_ Fatigue physiological character, 30 'poison,' effect of, on, 30, 32, 78, 79 relation between, and stimulus, 52, 53, 54 staircase effect, 37, 185 stimulus, effect of single, on, 35 effect of superposition of, on, 35 temperature, effect of, on, 32, 59-69 uniform, 36, 184 radial E.M. response in, 49