- 



i 



G 



THE CAUSES OF FLUCTUATIONS IN TUKGESCESCE 



dby 



of various species of plants, wo find that a distinct and 



direct relation is traceable between rapidity of 



t 



filtration. In 



of Cas 



ery 



but 



a 7 ata and C. sumat 

 are invariably slo 



tl 



I textural facilities for 

 wements, when at their 



d gradually carried out 



tl 



pulvinar parenchyma is very dense and scantily pitted; in Pithecohbivm samm. and 



more 



L 



9 



?ry 



the rate of movement 



i 



lerably increased, and the 



pulvinar parenchyma, although unprovided 



with 



fully- developed sy 



of intercellul 



•paces 



composed o 



f cells the walls of which 



y abundantly pitted 



and 



in 



primary pnlvini of M> 



pitdi 



movement 



a maximum 



pidity, and the 



tissues are not 



most elaborately and 



ly pitted, but arc provided 



ith 



a 



ry highly-developed sy 



of intercellular spaces, affording abundant 



to ar 



filtrat 



y 



fluid which may escape from the cell cavities in 



equence of any 



odution 

 creased 



CHAPTER X. 



movements 



the 



$timosa mfticft. 



Tl 



gener 



appeal 



of tl 



leaves of Mimosa piuUca is, of course, f 



to 



y one, but it is 



7 



to allude to 



tain of their characters in 



some 



detailed fashion, seeing that these have an important bearing 

 they are capable of executing movements under certain condit 



the rapidity with which 



rn 



The following data 



obtained from 



active leaf 



1. Weight of tbe entire leaf 



2. Weight of the oetiole inn 



3. Weieht 



6. 



*.' 



• • • 



• • t 



4. Length __ a _ 



5. Thickness of 



of the secondary pulvini, secondary 



pnl 



grammes. 



• • * 



and pin 



• ■ ■ 



• • • 



• • • 



• ■ • 



o-oc 



<K>0 



2r 



0005* 



gth of 



marv 



primary petiole 

 vinus to the Doi 



the 



of 



of the pri 



secondary ones 



of the proximal 



f 



• • • 



- . • 



• i • 



1 



7. Length of the remaining portion of the primary 



the sites of origin of the proximal and distal 



e between 

 of second- 



ary pulvini 



• • • 



• ♦ . 



8. Length of the secondary petioles, including the 



(a) Proximal pair 



0-125* 



♦ • ♦ 



D 



• • • 



• • ft 



9. Length of secondary pulvini 



10. Thickness of secondary pulvini 



11. Number of pinnules on secondary petioles 



#•# 



» • • 



• • • 



• • ft 



• • • 



2-20* 

 2-92" 



012* 

 0-09 



(a) Proximal pair 



• • • 



• * • 



(b) Distal 



• • • 



12. Area of 



• • • 



surface (determined by gumming down the 



19 

 19 



25 

 24 



detached pinnules on a sheet of paper, so as to form 



tinuous 

 1 3. Number 



a con- 



• • # 



• • • 



* » • 



4 



y* 



yy 



•> 



j> 



yy 



>y 



>> 



*y 



yy 



y> 



square inches. 



(«) Superior epidermis 

 (h) Inferior epidermis 



• • • 



t # • 



• • • 



« • * 



• • • 



14. Number of stomata on entire laminar surface 



• • « 



.eh 



... 400,000 

 ... 3,920,000 



.•> 



