362 RESEARCHES ON IRRITABILITY OF PLANTS 



23. Staircase response in Mimosa 



24. Modification of tonicity by stimulus 



25. Alternating response . 



26. Fatigue reversal in Mimosa 



PAGE 



76 



79 

 80 

 81 



Effect of External Conditions on Simple Response 



Effect of sudden darkness . . . . . .87 



Abolition of motile response by absorption of water . 88 



Restoration of motile excitability by action of glycerin . 88 



Stimulating effect of ozone ...... 89 



Effect of carbonic-acid gas ...... 91 



Effect of alcohol . . . . . . .91 



Effect of ether ........ 92 



Effect of carbon disulphide ...... 92 



Effect of coal gas ....... 93 



Effect of chloroform ....... 93 



Action of ammonia in abolition of excitability . . 94 

 Abolition of excitability and death of plant under sul- 

 phuretted hydrogen ...... 95 



Toxic effect of nitrogen dioxide ..... 96 



Poisonous action of sulphur dioxide .... 96 



Determination of the Death Point 



Death record of Mimosa . . . . . .102 



Abolition of mechanical response after death . .103 



Determination of death point of Desmodium . . .104 



Death point of bean plant . . . . . .104 



Determination of death point in ordinary plant . .104 



Lowering of death point under fatigue . . .106 

 Translocation of death point under the action of dilute 



poison . . . . . . . . .106 



Determination of Latent Period 

 Mimosa 



48. Identity of latent period in successive experiments . 115 



49. Determination of latent period in highly excitable Mimosa 116 



50. Value of latent period unaffected by peculiarity of 



recorder . . . . . . . . 11S 



51. Simultaneous excitation in intra-electrodal tract . .124 



52. Effect of intensity of stimulus on latent period . .125 



53. Constancy of latent period under maximal stimulus . 127 



54. Effect of optimum condition on latent period . .128 



55. Effect of fatigue 129 



56. Effect of temperature . . . . . .130 



Biophytum sensitivum 



57. Determination of latent period of Biophytum . . 281 



