PERMEABILITY BY THE METHOD OF TISSUE TENSION 569 
writer's experiments on Laminaria, by a diffusion method, are also in 
essential agreement with these experiments.^ 
10 10 50 50 70 50 h^mute^. 
Fig. 3 
Table 2 
Time Required for Successive Recoveries, Taraxacum 
Solution 
Con- 
centration 
Increase 
of Concen- 
tration 
Minutes in 
Solution 
Before ist 
Recovery 
Recovery Time, Minutes 
ISt 
2d 
9.0 
51 
8 
3d 
4th 
5th 
6th 
7th 
13.0 
18 
KNO3 
CaCl2 
Saccharose . 
0.21 
0.165 
0.35 
0.0075 
0.0041 
0.0064 
9 
14 
IT 
6.5 
24 
5 
7.5 
83 
12 
9.0 
14 
II.O 
10 
10. 0 
24 
In view of the widespread assumption that protoplasm is in general 
impermeable to saccharose, and that cells may be kept in solutions of 
saccharose without suffering any change in permeability,^ the data of 
^ In process of publication. 
^ Cf. Lepsechkin (6). 
