Plant Response as a Means of Physiological Investigation

Robinia, diurnal sleep movement of, 628 Root and shoot, no polar difference between, 512 ,, difference of effect between excitation at tip or growing region, 513 ,, electric response, on direct stimulation of growing region, 518 ,, ,, ,, on stimulation of tip, 517 Sachs on action of light on Marchantia thallus, 622 ,, on characteristic effects of light, 567 ,, on heliotropic response of Troptcolum majus, 623 Seasonal variation of conductivity and excitability, 474 ,, ,, of contractility, 79

Sensitiveness, abolition by over-turgidity, 58 ,, modification in darkness, 22, 50 Simultaneous mechanical and electrical records, 34 Sinapis nigra, effect of diffuse light on growth of, 572 „ negative heliotropic response of root of, 601 ,, positive, dia-, and negative hejiotropic response of, 609 ,, positive heliotropic response of seedling of, 592 Sodium carbonate, effect of solution of, on growth, 481 chloride, effect of solution of, on growth, 484

,, different modes of transformation of, 123- 126 ,, supposed explosive effect of, 454 Strasburger on action of light on autonomous movements, 690 ,, ,, of poison on ascent of sap, 361 Sugar, chemotactic effect of, 699 ,, chemotropic effect of, 549 Sugar, effect of solution on growth, 482 Sunflower, impressed periodic movement in, 685 Tamarindus indica, diurnal variation in the rate of growth of, 474 ,, ,, initiation of growth in, by stimulus, 425

Temperature and growth, relation between : determination by Continuous Excitatory Response, 452 ,, and rhythmic frequency, relation between, 349 Tesla current, effect of, on growth, 619 Tetanus in muscle, 98 ,, in plant, 99 ,, incapability of, in rhythmic tissue, 340 Thermal radiation, discrimination between effect of, and temperature, 615 Thermo-crescent curve, 447 Thermographs, development of, 184 Tip of root or shoot, electric response on stimulation of, 517, 518

,, effect on excitability on amputation of, 541 Tonic condition, modifying effect of, on relation between stimulus and response, 465 Transmission of heliotropic excitation, 604 Transpiration, automatic record of variation of, 371, 472 Turgidity, positive and negative variation : electrical indication of, 37, 41 Variation, induction of, by external forces, 750 Verworn on polar excitation of protozoa, 200 Vines on autonomous epi- and hypo-nasty, 643

,, on protoplasmic irritability, 53 Vintschgau on velocity of nervous impulse, 246 Visual impulse, multiple, 286, 300 Vitalism, 740 Vitis, heliotropic response of tendril of, 611 Vochting on theory of recti-petality, 594 QK Bose, (Sir) Jagadis Chundr r 771 Plant response as a means