5 6 7 
Electrolytes upon Cells of Saxifraga umbrosa. 
‘ poisoned 5 ; moreover, at the time the potassium dichromate is able to 
penetrate the protoplasm the tannin is able to diffuse out of the vacuole. 
Results. 
The times of immersion (critical times) for the various concentrations 
are quoted in Table IV. As the curves for time and concentrations all 
follow the type already recorded they are not drawn, but the graphs for 
log T and log C+i are shown in Figs. % and 3 . It will be seen 
that study has been made of a series of potassium salts and of three 
sodium salts, to try to discover whether anion or kation determines the 
Fig. 2. K salts. 
Table I. 
Resistance of o-i per cent, solution K 2 Cr 2 0 7 . 
Electrodes = platinized plates. 
Date. 
Age of 
7 emperature of 
Mean value of 
Solution 
Thermostat . 
Resistance . 
1918. 
Days. 
Degrees Centigrade. 
Ohms. 
July 31 
0 
25 
428-7 
Sept. 2 
33 
25 
429 
Sept. 4 
35 
24-95 
424-9 
Sept. 9. 
40 
25 
428-7 
Sept. 11 
42 
24-95-25 
428-3 
