

PLATES. 



Fig. 5. Pithecolobium soman 



Fie. 6. Ditto 



o' 



Fig. 7. ' Ditto 



secondary pnlvini and rachis, vertical transversa section; showing 

 the relation of the inner side of the inferior n-as-ea f 

 parenchyma to the bevelled surfaces of the rachis 



ditto; tertiary pulvinns, vertical transverse section 'of 'distal' portion '• 



shomog excess of chlorophyll in snperior parenchyma of a 



thick, opaque section 

 Fig. 8. Ditto ditto; tertiary pulvinus, vertical transverse 'section of basal 



portion ; 



showing excess of chlorophyll in snperior parenchyma of a 



thin, transparent section 



Fig. 9. Ditto ditto; tertiary pulvinus ; a, tissue of superior, !,, of inferior paren 



chjma 



PLATE V. 



Fig. 1. JUimosa pudica ; pinnules in f ull nocturnal position ; showing origin of pulvini from 



Levelled surfaces of rachis 

 Fig. 2. Ditto ditto; pinnules in full diurnal position, viewed from above 

 Fig. 3. Ditto ditto; bases of two pairs of pinnules in diurnal position: 



ping of successive pairs. 

 Fig. 4. Ditto ditto'; pinnules in full diurnal position, viewed from beneaf 



howin 



Fig. 5. Ditto ditto; diagram of origin of pinnular pulvini from the bevelled surfai 



of the rachis, so that the inferior mass of nnronnhtrna -*-i^ 



*es 



151 



x 10 



x r>20 



x 



x 60 



x 520 



x 10 

 x 10 



25 



convergence and elevation, and the superior one for divergence and 

 depression of the lamina. 

 Fig. 6. Ditto ditto; diagram showing the full nocturnal position of the pinnae and 



pinnules. . 

 Fig. 7. Ditto ditto; longitudinal, vertical section of a portion of an axis; a, portion 



seared by means of heated forceps ; b> normal portion . # . 9 , 

 Fig. 8. Ditto ditto; transverse section of mature axis; showing uniform density of tissue 



throughout its entire thickness • . . x 50 



Fig. 9. Ditto ditto; stomat a of inferior epidermis of a pinnule x 160 



Fig. 10. Ditto ditto; stomata of superior epidermis of a pinnule • •••••... x 160 



Fig. 11. Ditto ditto; vertical section of lamina ; showing very open tissue x 150 



Jbig. 12. Ditto dido; diagram showing the divergence of the pinnae in a leaf; blue lines= 



position of full expansion ; led lines = position after searing the tips 

 of distal pinnules had led to complete pinnular assumption of the 

 maximal nocturnal position and deepest depression of the primary 

 petiole ; black lines = normal position of pinnae in maximal nocturnal 

 . position; illustrating the minor "irritability " of the secondary 



pulvini. 

 Fig. 13. Ditto ditto; diagram illustrating the divergence of the pinnae of a leaf; red lines 



^position half an hour after separation of the leaf from the axis 

 and maximal action of the pinnules; blue lines = position after 



* * 



half an hour's exposure to hot, dry air. 

 Fig. 14. Ditto ditto; permanent position of the primary petiole in a very young leaf 



in which nyctitropic movements had not yet appeared . . . . x 5 



Fig. 15. Ditto ditto; primary petiole; vertical, transverse section; showing large intercel- 



lular channels 



x 23 & 92 





