CONTENTS 



XXXVJll.— RESPONSE OF PLANTS TO WIRELESS STIMULATION. 



PAGE. 



Effects of different rays of spectrum on t;ro\vtli — The 

 wireless system — Meciianical and electrical responses of 

 Mimosa to Hertzian waves — Effect of wireless stimula- 

 tion 01) growth of plants , . . . . .416 



XXXIX.— GEOTROPISM. 



Direction of the stimulus of gravity — The Geotropic 

 Recorder — Determination of the character of geotropic 

 reaction — Theory of statoliths — Determination of the 

 latent period — The complete geotropic curve — Determin- 

 ation of effective direction of stimulus of gravity — 

 Algebraical snnimation of effects of geotropic and photic 

 stimulus — Analogy between the effects of stimulus of 

 light and of gravity — Relation between the directive 

 angle and geotropic reaction — Differential geotropic 

 excitability ......... 425 



XL.— GEO-ELECTRIC RESPONSE OF SHOOT. 



Electric response to direct and indirect stimulation — 

 Experimental arrangement for obtaining geo-electric 

 response — Geo-electric response of the upper and lower 

 sides of the organ — Method of Axial Rotation — Charac- 

 teristics of geo-electric response — Physiological character 

 of geo-electric response — Effect of differential excitabi- 

 lity of the organ — Law determining the relation between 

 angle of inclination and geotropic effect — Method of 

 Vertical Rotation — Electric response through an entire 

 cycle — Relation between angle of vertical rotation and 

 intensity of geo-tropic reaction ..... 442 



