INDEX 77[ 



Heliotropic sensitiveness, localisation of, 604, 650 



,, ,, supposed absence of, in organs, 610 



Heliotropism, theory of Darwin, 582 



,, ,, de Candolle, 580 



Hydraulic model, 31 



,, response, 363 



Hydrogen, effect of, on mechanical response, 131 

 Hydrostatic disturbance, effect on electric response, 35 



,, ,, ,, mechanical response, 24 



,, versus true excitatory effect, 35, 47 



India-rubber, contractile response of, 12 



,, fatigue-reversal of, 120 



Indicator diagram, 2 

 Inner stimuli cause of growth, 421 



,, ,, derived from external, 355 



Inorganic response, 12, 13, 40, 118 



,, ,, abolition of, by poison, 40 



,, ,, fatigue in, 119, 120 



,, ,, staircase effect in, 121 



Internal energy, 308 



,, ,, antagonistic action of, and external stimulus, 403 



,, ,, effect of, on amplitude of pulsation, 338 



,, ,, ,, on frequency, 338 



,, ,, a factor of recovery, 401 



,, ., spontaneous movement initiated by excess of, 305, 306 



,, ,, tonic condition dependent on, 308, 314 



Ipo/inva, torsional response of, 670 

 Isometric record, 25 

 Isotonic record, 25 



Ivy, seasonal variation of heliotropic sensibility of, 623 

 ,, variation of electrical response by temperature, 141 



Jennings on chemotaxis of protozoa, 699 



Kat-ei.ectrotonus, 235 

 Kathode, effect of, on growth, 556 



,, excitatory effect of, 192-197 

 Kuhne on polar excitation of protozoa, 200 

 Kunchangraph, 71 



Lamina not perceptive organ, 60, 588, 650, 651 

 Latent period, diminution of, by strong stimulus, 271 



,, ,, in Mimosa, zz, 268 



,, ,, prolongation of, by cold, 141, 268 



,, ,, ,, by fatigue, 269 



Lateral geotropism, 672 



,, response, general absence of, in radial organs, 50 



,, ,, necessary conditions for, 44, 48 



