

APPENDICES. 



135 



more reasonable to account for the phenomena as the result of 



rmly depressant factor 



affecting the assimilatory activity of the protoplasts of all the motor organs alike, but whose effect! 

 manifest themselves in unlike fashion in parts which differ from one another in structural 

 peculiarities and in their relations to other parts of the leaf. Loss in osmotio capacity, and examine 



ne< . 



transpiratory loss, work hand in hand in making for the elevation of the pinnule?, whirl, is de rmined 

 by the excessive structural streugtli of the inferior mass of parenchyma in the tertiary pulvinus; the 

 same factors come into play locally to give rise to a tendency towards depression of the primary 

 petiole, but here the weakening of the inferior mass of pulvinar parenohytna is discounted by the 

 coincident diminution in the resistance which it has to overcome eonneoted with the 

 decrease in distal leverage attending excessive transpiratory loss. Finaliy, in the seeondary pulvini 

 there is an absence of any highly developed differences in the structural and functional pro- 

 perties in the masses of tissue which make respectively for divergence ami divergence, and with this 

 any liability to the occurrence of rapid movements necessarily diminishes 

 of vapour of chloroform is incapable of inducing sudden movements; exposure to a desiccated 

 atmosphere, unless the degree of aridity be very excessive, is equally inefficient; but the has of 

 osmotic property connected with the depression of functional activity caused by the action of the 

 vapour of chloroform facilitates the occurrence of losses of turgeseence to such an extent as to ensure 

 the occurrence of rapid movements wherever conditions favouring active transpiratery removal ot 

 water are present in high degree. 



ucnoe 



APPENDIX 1) 



ON CERTAIN COMMONLr-ACCIPTED BUT ERRONEOUS STAIT.MENIS RKGARUISO I'HOOMfvNA 



PRESENTED BY MIMOSA PUDICA. 



/, — That, in the initial nocturnal position of the leatcs during the earlier portion* of the night. 



the primary petioles are in a position of deep depression. 



♦ 



The following notes give the results of observations in regard to this point, which were cairkd out 



at various times of year: 



January 27th, G p.m. Pinnae and pinnules in flMUti 

 petioles highly elevated, but becoming deeply depressed on contact impulses. 



P 



Experiment III.— February 1st, 6-20 p.m./ . . . , , . w»;, „. ,i„„ 



J \ Results precisely similar to tliose ot the previous day. 



Experiment IV. — February 8th, G p.m. 



Expeiument Yc 



Experiment VI.— May 30th, 7 p.m. Hun® and pinnnles in maximal nocturnal position. Primary 



petioles horizontal or slightly elevated. 



Experiment VII.— October 11th, 6 p.m. Pinna) and pinnules almost in maximal nocturnal position 



Primary petioles horizontal or slightly elevated. 



October 31th, 8-30 p.m. Pinnos and pinnules in maximal nocturnal position. Primary petioles 



horizontal or slightly elevated. 



October 12th, 12-15 a.m. Pinnaa and pinnules as before. Marked increase in elevation of the 



primary petioles. 



The observations of the 27th and 28th January and of the 1st, 8th, and 1 1th February were 

 conducted in regard to very young plants in which the numbers of pinna, and of pinnules in the 

 leaves were still small, the pinnae, as a rule, being only t«o or three in number and bearing only 

 a limited number of pinnules. This probably accounts for the fact that in all cases the primary 

 petioles were highly elevated, as in such leaves, apparently in connection with deficiency of distal 

 leveiage, excessive elevation of the primary pcti-lc « of constant occurrence. T he laminar portions 



* * SacLs VorlesuDgcn ; Vorlesung, XXXVII, a. 789. 



Ann. Ploy. Bot. Garp. Calcutta Vol. VI 



