

APPENDICES. 



141 



some hours in a sulphuric acid chamber 



throughout the injured 



leaf and was propagated to all tie other leaves on the single axis of which the plant was composed. 

 I Experiment XIX.- June 12th. Soil very moist, atmospheric humidity % /,_ T he application of flame 

 to the terminal pinnules of distal pinnae of leaves of plants growing in the open ground was followed 

 by very slow and imperfect elevation of the pinnules of all the piunsa, and by slow and incomplete 

 depression of the primary petiole. There was never anv Dnrouratinn „f mftwm « 



XX.-— June 9th. Rain was ft 



other leaf. 



The 



application of flame to terminal pinnules of distal pinna was followed by slow and imperfect 



elevation of all the pinnules of 



to any other leaf occurred. 



the case of one loaf which 

 petiole. No propagation 



XXI.— June 15th. The sky was 



falls of 



were occurring at frequent intervals. The soil was very moist.-The application of ilame to the tips of 

 terminal pinnules was followed by very slow, incomplete elevation of the pinnules of all the piun® 

 and very slow, incomplete depression of the primary petiole of the injured leaf. No propagation of 

 movement to any other leaf occurred in any case. 



Experiment XXII.— June 16th, 8 a.m. Atmospheric temperature S0-5°F. Humidity 92 per cent. The 

 morning was cool and still. Heavy rainfall had occurred just before the period of experiment. There was 

 brilliant sunshine, but the plants were not directly exposed to it.— The application of flame to the tips of 

 terminal pinnules of distal pinnae was followed by slow and almost complete elevation of the pinnules 

 of the injured pinna, and by slow, imperfect action in the opposite distal pinna and in the proximal 

 pinna on the same side as the injured one. No action whatever occurred in the pinnules of the 



remaining pinna or in the primary petiole, and there was no propagation of movement to any other 

 leaf. 



Experiment XXIII.— June 21st, 8 a.m. Atmospheric temperature 8V5°F. Humidity 91 per cent. 

 The sky was completely covered with cloud, but no rain had fallen during the night, and th* leaves were 



consequently dry. — The 



terminal pinnules of 



by complete action throughout the injured leaf, save in one case in whioh no action occurred in the 

 proximal pinna of the opposite side of the leaf, and another in which the primary petiole did not 

 undergo any depression. No propagation of movement to any other leaves occurred. 



Experiment XXIV.— June 23rd, 8 a.m. Atmospheric temperature 77'5°F. Humidity 97 per cent. 



r some hours previous, and was still falling heavily. Everything teas drenched 



fallen continuously /< 



with moisture. — The 



charri 



■■ ~- — — — - 



them was followed by slow action of the pinnules, never extending over more than three pinme, and, 

 where the leaves were not heavily loaded with adherent drops of rain, usually unattended by any depres- 

 sion of the primary petiole. In no case was there any propagation of movement to any other leaf. 



Experiment XXV.— June 26th, 8 a.m. Atmospheric temperature, 81* 5° F. Humidity 90 per cent. The 

 leave* were dry, but the soil teas drenched with moisture. The morning teas bright, but t/nre teas an absence 

 of direct sunshine.— The application of flame to the tips of terminal pinnules of distal pinnae was followed 



red 



irimary 



in 



petiole, partial action in the pinnules of the proximal pinna of the injured side and 



opposite distal pinna. In one or two instances incomplete elevation also occurred in the pinnules of the 



remaining pinna. In no instance was there any propagation of movement to any other leaf. 



Experiment XXVI -June 29th, 8 a.m. Atmospheric temperature 79'5°F. Humidity 94 per cent. 



falling heavily.— The application of flame to the tips of terminal pinnules was followed only by 



very slow elevation of the pinnules of the injured pinna, and by incomplete elevation in those of 



the remaining ones. Depr 

 movement to any other leaf. 



occur, and there was no propagation of 



d.— Effects of the application of heat to a point in the course of a mature axis. 



Experiment XXVII -July 20th, 8 a.m. Atmospheric temperature 80'5°. Humidity 95 per cent 

 Heavy rain had fallen alt night, and rain teas still falling. Everything wai drenched <cith moisture. -The 



Ann. Roy. Bot. Gard. Calcutta Vol. VI. 



