422 



M 



Effect of concentrated solutions 



Summary 



The results of the above experiments may be summarized in 



the following tables : 



Table I 



Isotonic concentration 



Plant. 



Philotria (leaf)'. 

 Tradescantia discolor 

 (lower epidermis). 

 Beta vul-^a7'is (root). 



Potassium 

 nitrate. 



Norma!. 





i 



Glycerine 



?-5 



2.52 



2.02- 



1,68 



6.73 



2.25 



Normal. 



St 



Urea. 



Acetamid. 



1 



i-i 



1 

 T 



3-07 



1. 84-1. 53 

 6.13 



3-07 



Normal. 



1 



1^1 



1 1 



* 



2.0 



1.2-1,0 



9.0 

 2.0-3.0 



Normal. 



l_l 





* 



2.95-1.97 



I.48-I.18 

 8.85 



3.94 



Table II 



* 



Increase in concentration of cell-sap 



Plant. 



Plasmo- 

 J y zing 

 agent. 



Concentra- 

 tion of plas- 



molyzing 

 agent. 



Philotria. [Glycerine.! 



Urea. 



Acetamid. 



Trades- 

 cantia 



discolor. 



Beta vul- 

 garis. 



Glycerine. 

 Urea. 



Acetamid. 



Glycerine. 

 Urea. 



Acetamid. 



Spirogyra.^ Glycerine. 



N. 



i 

 1 



\ 



\ 



1 



t 



Urea. 



Acetamid. 





A 



1 



1 



1 



i 



3-07 



3-07 

 2.0 



1-5 



2.95 



1.97 



1.S4 



1.2 



I.O 



1. 18 



1.48 

 6.13 



g.o 

 8,85 



1.84 



3-07 



2.0 



3-0 



3-93 

 2.95 



Duration 



ct 



action. 



5 hrs. 

 24 '• 



7 " 



24 *< 



15 min 



6 hrs. 



7 '' 

 8 



t < 



30 mm. 

 30 '' 



6-24 hrs. 



7 



(( 



10-15 ^'^* 



4-5 hrs. 



4-5 " 

 24 '* 



4-6 '* 



5-10 min. 





Isotonic concen- 

 tration of KNO3 



N. 



9 



9 



^^ 

 2 



1 



J 

 1 



i 



1 

 1.6 



1.6 



9 



i 



I 



ji 



-I 3 



3-36 



4-55 



4.5s 

 4.04 



3-36 

 2.02 



2.02 



2.02 



2.02 



16.16 

 16.16 

 15.15 



4-55 

 5.05 

 6.73 

 5-05 

 6.73 

 6.73 

 505 



Increase 



of KNO3. 



0.84 



2.0J 

 2.03 

 1.52 



o. 84-2 . 5 3 

 0.84 



1. 34-1. 68 

 0-0.34 

 0-0. 34 

 0-0.34 

 0-0.34 



9-43 



9-43 

 9.42 



2.30 



330 

 448 

 2.80 



4.48 



4.48 



2.80 



Increase in 



concentra- 



lion of 



cell-sap. 



1-33 



1.80 



I. So 



1.60 



1.33-2.0 



1.^2 



1.66-2.0 

 1-1.2 

 1-1.2 

 1-1.2 

 I-1.2 



1.4 



1-4 

 r.6 



2,02 



2.24 



2.99 

 2,24 



2.99 

 2.99 



2.24 



Discussion 



In carrying on plasmolytic experiments remarkable variability 

 in the reaction of different cells, tissues, and plants may be 

 observed. Yet there seem to be very definite influences at work 

 which affect osmotic activity. 



