index 777 



Pfeffer on effect of light on autonomous response, 690 

 ,, on excitatory contraction in Cynereee, 69 

 ,, on expulsion of water from excited pulvinus of Mimosa, 254 

 ,, on geotropic sensitiveness of root-tip, 542 

 ,, on radial pressure theory of geotropism, 494 

 Pflliger on law of polar excitation in animal tissue, 200 

 Philanthits urinaria, response of, 44, 271 

 Photonasty, 621 

 Phototaxis, 696 



Physical phenomena, merging of, into chemical, 122 

 Plagiotropic stem, daily periodic movement of, 627 



,, ,, response of, to light, 624, 625, 626 



,, ,, ,, to thermal shocks, 85 



Plant-chamber, 16 

 Plasmolytic action, anomalous, 549 

 Poison, abolition of inorganic response by, 40 

 ,, effect of, on autonomous pulsation, 326 

 ,, ,, on growth, 486 



,, ,, on mechanical response, 132 



,, ,, on suctional response, 386 



,, modifying action of constitution on the effect of, 322, 487 

 ,, opposite effects of dose on action of, 488 

 Polar action of currents : effect of fatigue on, 208 

 ,, ,, ,, ,, high E.M.F., 207 



,, ,, ,, ,, low E.M.F., 195 



,, ,, ,, ,, moderate E.M.F., 197 



,, ,, ,, indirect effect of, 558 



,, ,, ,, laws of, in plant, 199, 207, 558 



,, ,, ,, localised eflect of, on pulvinus, 554 



,, effects of currents : localised action on pulvinus, 554 

 ,, „ ,, on death-response, 186, 207 



,, ,, ,, on glow-response, 21 1 



on growth, 557, 558, 559, 560 

 ,, ,, ,, on mechanical response, 193-206 



Parana paniculata, autonomous torsional response of, 670 

 Pressure, internal hydrostatic : irregular variation of, 395 

 ,, ,, ,, positive and negative, 393 



Protozoa, polar effects in, 205 

 Pseudo-conduction, 251 



Pulsation, discrete nature of, in Desmodium, 340, 341, 431 

 „ intermittent human, 288 



,, ,, in Biophylum, 289 



Pulse, healthy adult and senile, 3 



,, human, nitrite of amyl on, 4 

 Pulvinus and pulvinoid, 54 



Radiation, discrimination from temperature effect, 615 

 ,, effect of electric, on Mimosa, 619 



,, ,, thermal, 615-617 



