XXXVi PLANT RESPONSE 



PIG. i'AGE 



205. Diagrammatic Representation of Experiment showing Curvature 



Induced by Unilateral Pressure Exerted by Particles . . . 497 



206. Record of Responsive Curvature induced in Crinum under Experi- 



mental Conditions shown in fig. 205 ...... 498 



207. Record of Apogeotropic Response in Scape of Uriclis Lily . . . 500 



208. Response Records showing Differences in Rate of Curvature 



according as Specimen is held at Angles of 45° and 135 . . 501 



209. Diagrammatic Representation of Different Positions of a Single 



Cell, according as the Specimen is held at an Angle of 45 

 or 1 35 , showing Consequent Redistribution of Statoliths (after 

 F. Darwin) 502 



210. Effect on Apogeotropic Movement of Application of Ice-cold Water 



to Upper and Lower Surfaces alternately of a Horizontally laid 

 Crinum Lily .......... 504 



211. Effect on Apogeotropic Movement of Temporary Applications of 



Cold alternately to Upper and Lower Surfaces of Horizontally 

 laid Scape of Uriclis Lily . . . . . . . . 505 



212. Experimental Connections for obtaining Electrical Response due to 



Direct and Indirect Effects of Stimulation 515 



213. Record of Positive Electrical Variation, indicating Positive Turgidity - 



Variation (represented by Down Curve), induced in Growing 

 Region by Moderate Stimulation on same side of Tip . . . 517 



214. Record showing Galvanometric Positivity subsequently Neutralised 



under Transmission of True Excitatory Effect, due to Continuance 



of Moderate Stimulation of the Tip . . . . . .517 



215. Record showing Neutralisation and Reversal of Electrical Response 



at Responding Region, under Strong Stimulation of Tip . . . 518 



216. Record showing Negative Electrical Response represented by Up 



Curve, indicating Negative Turgidity -Variation due to Direct 

 Stimulation . . . . . . . . . .518 



217. Record showing Positive Electrical Variation indicating Positive 



Turgidity- Variation of Distal Point, under Moderate Stimulation of 

 Proximal ........... 519 



218. The Relative Electrical and Turgidity Variations of two Diametri- 



ally Opposite Points when Strong and Long-continued Stimulus 



is applied . . . . . . . . . . .521 



219. Mechanical Responses of Shoot and of Root to Unilateral Stimulus 



applied at the Tip .......... 526 



220. Mechanical Response of Root of Bindweed to very strong Unilateral 



Stimulation applied at the Tip 527 



221. Mechanical Responses of Peduncle of Crocus and Root of Bind- 



weed to Unilateral Thermal Stimulation at the Growing Region . 527 



222. Diagram showing the various Responsive Effects induced at the 



Growing Region . ......... 529 



223. Experimental Arrangement for obtaining Records on Smoked 



Drum of Responses given to Direct and Indirect Stimulation by 

 Leaf of Mimosa ... . . . . . . 530 



224. Mechanical Responses of Leaf of Mimosa . . . 531 



