Poison, effect of, on response in metal, 143, 189 in nerve, 139, 189 in plant, 30, 32, 78, 79, 189 'molecular arrest' in metal by, 145 prolongation of recovery by action of, in metal, 145 in muscle, 144 Record, simultaneous mechanical and electrical, of response, 13 Recorder, electrical, 11 mechanical, 3 photographic, 11, 22 response, 19 Response-curve, characteristics of, 3 electrical, abnormal, in metal, 123, 125 in stale nerve, 11, 123 in stale or dying plant, 48, 187 in stale retina, 11, 164 converted into normal after strong or continuous stimulation in metal, 125, 187 in nerve, 124, 187 in plant, 48 abolition of, by high temperature in plant, 32, 64 by 'poison,' in metal, 143, 189 in nerve, 139, 189 in plant, 30, 32, 78, 79, 189 additive effect of stimulus on, in metal, 135 in plant, 37 anaesthetics, effect of, on, in nerve, 72 in plant, 30, 73, 74, 75 annealing, effect of, on, in metal, 101, 138 by method of block, 28, 82, 92 by negative variation, 9, 18, 87, 183 by relative depression, 87 by relative exaltation, 89 conditions for obtaining, 6, 86, 87 continuous transformation from positive to negative in metal, 115 decline and reversal of, under continuous light in photo-sensitive cell, 166 decline and reversal of, under continuous light in retina, 166 depressants, effect of, on inorganic, 142 diminution of. _See_ Fatigue diphasic in metal, 113, 114, 115, 116, 188 in nerve, 188 in plant, 46, 188 dose, effect of, on inorganic, 89, 146, 189 on, in plant, 79, 189 enhancement of, after continuous stimulation in metal, 127, 128, 186 enhancement of, after continuous stimulation in nerve, 127, 186 maximum effect due to superposition of stimulus, 35, 136 measure of physiological activity, 13 molecular friction, effect of, on, 108, 109 modification, effect of, on, 11, 48, 123, 125, 129, 164, 187 physiological character of, in plant, 30 positive and negative, 11 prolongation of recovery in, by 'poison' in metal, 145 prolongation of recovery in, by 'poison' in muscle, 144 prolongation of recovery in, from overstrain, 106 relation between, and stimulus in metal, 134, 135 in muscle, 52 in nerve, 52 in plant, 52, 53, 54 in real and artificial retinae, 162 staircase effect, in metal, 122, 186 in plant, 37, 186 stimulant, effect of, on, in metal, 141 temperature, effect of, on. _See_ Temperature threshold of, 135 to light. _See_ Light uniform in metal, 102, 184 in nerve, 184