IN THE MOTOR ORGANS OP LEAVES. 



19 



1 



was removed from the 



and gently wiped dry 



♦ 



It now 



weighed 



onlv 



» 



9*53 grammes 

 of a pale och 



following day 



indicating 



a loss of 20 5 per cent. 



of total weight, and was flaccid and 



colour. It was next placed in a simple moist 



ber 



d by 



had 



discharged 



a considerable amou 



grammes 



It would be hard to find a more 



striking 



f fluid and weighed only 8*26 



demonstration of the fact that 



dity is distinct from simple saturation than is ail'ordcd by the results of this 



periment 



wl 



whilst the leaf 



was aetually submerged in 



the solution, such a 



considerable loss of fluid 



The most important 

 present chapter are the followi 



ed 



points which are 



ated by the experimental data in the 



1** 



That turgescence 



saturation of tissue elements including osmotic 



mate 



2nd 



That 



and must therefore bo 



dependent 



on 



certain tissue element 



lied from simpl 



ed vitality, the 



f 



to 11 



s are profoundly altered by conditions 



3>y7 



which produce no appreciable effect 

 That where turgescence is dependent 



or 



tal abolition may be determined by such 



those of others, 

 continued vitality, 



varied 



din 



idit 



a 



exposure to alkaline or 

 stances in solution, extre 



d 



vapou 



> 



of temp 



to anaesthetic- 



ure, mid elcctr 



y 



po 



sub 



cui rents. 



ith 



That the only other 



different factors prod 



common effect which these 

 ie tissues is the ultimate death of their living elements, or, in other 

 ords, that depression or abolition of functional activity leads to diminu 



disappearance of turgidity. But 



taken 



*- 



with the fact 



that we have abundant evidence that certain forms of stimulation give 

 rise to increase in cell -turgescence, and no unequivocal evidence that 



any forms of 

 believe that 



giv 



rise to 



d 



forces us to 



it is 



depr 

 any 



mo\ 



causes 



related to 



and dependent on diminished cell-turg 



and not stimulation of functional activity 

 i tents which are dete: mined by functional 



and th 



finally 



leads us to the 



eady arrived 



dependent grounds 



3 previous chapter, that it is fluctuatior 

 d respiratory function, and not fluctu 



tractile f 



at are 



■My 



the activity of assimilatory 

 ns in the activity of con- 

 d to movements coi 



nected 



th alterations in the turgescence of cellular vegetable 



* 







CHAPTER ni. 



%\\t relation cf turgescfttce to protoplasmic actitutji 



The facts which have been detailed in the preceding chapt 

 be regarded as evidence that turgescence is a peculiarity 



» 



directly and necessarily related 



s* might, if taken alone 

 of living tissues, and therefore 

 presence of living protoplasm ; and this opinion has 





-— r 



port 



nciadei 



petioles were detached in tlie course of any experiment*, tliey were, of 



Ann. Hoy Bot. Card, Calcutta Vol. VI. 



