778 PLANT RESPONSE 



Receptivity, variation of, 461 



,, ,, by anesthetics, 224 



,, versus conductivity, 226 



Recorder, Crescographic, 414, 416 

 ,, Demonstration, 6 

 ,, Electrical, 33 



,, Magnetically controlled, 568-5S8 

 ,, Microscopic, 519 

 ,, Optic Lever, 6, 16 

 ,, Spiral-Spring, 26 



,, Suctional, 340 

 Recti-petality, theory of, 593 

 Refractory period, 246, 273 

 Regional death, thermographs of, 183- 186 

 Relaxation, anomalous meaning of, 339 

 Response, different types of, 123 



,, identity of, in mature and growing organ, 435 

 ,, relation of, to stimulus, 95, 96, 97 

 ,, similarities of, between motile and growing organs, 437 

 See Cheiiiotactic-, Cheinotropic-, Death-, Differential-, Galvanotadic-, Gal- 

 vanotropic-, Geotropic-, Groivth-, Heliotropic-, Inorganic-, Mechanical-, 

 Phototropic-, and Suctional-. 

 Responsiveness in matter, universality of, 40 

 Retina, multiple excitation of, 286 



Rhythmic tissue, similarity of response in plant and animal, 345, 346, 348, 353 

 Rhythmicity, cause of, 309 

 Rigor, duplication of, 178 

 Rigor inortis, 153 



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 



Root-tip, effect of amputation of, on excitability, 540 



,, localisation of geotropic sensitiveness at, 539, 542 



Sachs on action of light on Marchaiitia thallus, 622 

 ,, on characteristic effects of light, 567 

 ,, on heliotropic response of Trop^roluin niajus, 623 

 Seasonal variation of conductivity and excitability, 474 

 ,, ,, of contractility, 79 



,, ,, of growth, 474 



,, ,, of heliotropic response, 623 



Selenium, response of, 39 

 Semi-automatism, 289 



Sensitiveness, abolition by over-turgidity, 58 

 ,, modification in darkness, 22, 50 



,, wide range in plants, 43 



Sesbania coccineum, death-discoloration of, 183 



