150 



DESCRIPTION OF 



Fiff. *). Bin him* corymbosa ; secondary pulvinus ; transverse vertical section of laminar expan- 

 sion in the nocturnal position x 50 



Fiff. 7. D*to ditto ; secondary pulvinus ; tissue of under surface of petiolar portion ♦ % 400 



Fig. 8, Ditto ditto ; ditto ditto ; tissue of upper surface of petiolar portion . x 400 



PLATE IIL 



Fig. 1 . Cms 



owin 



of the leaves ere nyctitropic movements begin to occur. 



1 g & Dtto ditto 



V ?. 2. Ditto ditto; secondary pulvinus and base of lamina of a pinna viewed from the 



under surface ; showing the spiral disposition of the opposed 



masses of pulvinar parenchyma X JO 



secondary pulvinus and base of lamina of a pinna viewed from the 

 under surface ; showing spiral arrangement of the opposed 

 masses of pulvinar parenchyma x ]0 



Fig. 4. Ditto ditto; portion of a leaf; showing diurnal position of mature but still 



nyctitropic pinnae, and the purely local effects of exposure to the 

 vapour of chloroform ; twenty-four hours after the lower 

 portion of the rachis and the lower pair of pinnse had been 

 exposed to the action of the vapour of chloroform and when the 

 lower pair of pinna) were dead and flaccid, and the upper pair 

 quite turgid and in normal diurnal position. 



Fig. 5. Leucaena glauca ; transverse vertical section of primary pulvinus showing the very 



excentric position of the fibro-vascular axis x 25 



Fig. 6. Ditto ditto; ditto ditto ditto ditto x 10 



Fig. 7. Ditto ditto; extremity of growing axis; showing the positions of the 



various 



part 



Fig. 8. Ditto ditto; transverse vertical section of secondary pulvinus; showing circular 



outline and relative strength of the fibro-vascular axis x 10 



Fig. 9. Ditto ditto; transverse horizontal section of secondary pulvini of a distal pair 



of pinnce. 



Fig. 10. Ditto dUto; pinnules beginning to assume the nocturnal position ; showing 



pulvinar expansion over base of under surface of outer half of 



lamina 



x 10 



PLATE IV. 



a very young 



F lg . 1. Pdhecolobiumsaman: primary pulvinus, vertical transverse section; from _, 



v leaf ; showing excess of inferior parenchyma . . / /7"! x 10 



4H* 4 BMo dUto; primary •pulvinus, vertical transverse section ; from a mature leaf ; 



xv « n .. showing excess of superior parenchyma ... ' x 10 



*i* 4. D,tto ditto; secondary pulvinus, vertical, longitudinal ~*1 ' . \L J ' 



vertical, longitudinal section; showing 

 excess in thickness and in chlorophyll content of the inferior 

 ,.,. parenchyma 



* 4. Ditto ditto; secondary pulvinus, vertical transverse ' section;" she win. ' g^at 



vertical compression of fibro-vascular axis 



x 20 



x 25 



