362 RESEARCHES ON IRRITABILITY OF PLANTS 



PAGE 



23. Staircase response in Mimosa ..... 76 



24. Modification of tonicity by stimulus . . . -79 



25. Alternating response ....... 80 



26. Fatigue reversal in Mimosa . . . . .81 



Effect of External Conditions on Simple Response 



27. Effect of sudden darkness ..... 



28. Abolition of motile response by absorption of water 



29. Restoration of motile excitability by action of glycerin 



30. Stimulating effect of ozone . 



31. Effect of carbonic-acid gas . 



32. Effect of alcohol 



33. Effect of ether .... 



34. Effect of carbon disulphide . 



35. Effect of coal gas 



36. Effect of chloroform . 



37. Action of ammonia in abolition of excitability 



38. Abolition of excitability and death of plant under sul 



phuretted hydrogen ...... 



39. Toxic effect of nitrogen dioxide . 



40. Poisonous action of sulphur dioxide . 



Determination of the Death Point 



41. Death record of Mimosa .... 



42. Abolition of mechanical response after death 



43. Determination of death point of Desmodium . 



44. Death point of bean plant .... 



45. Determination of death point in ordinary plant 



46. Lowering of death point under fatigue 



47. Translocation of death point under the action of dilute 



poison ......... 



Determination of Latent Period 



Mimosa 



87 



89 

 91 

 91 

 92 

 92 

 93 

 93 

 94 



95 

 96 

 96 



102 

 103 

 104 

 104 

 104 

 106 



106 



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 . . . . . . . .118 



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 



