56 Stiles and Jergensen. — Studies in Permeability . IV. 
Thus, a molecular solution of pyridine and an 0*2 m. solution of isoamyl 
alcohol both produce rapid exosmosis of electrolytes from the cell ; but, 
owing no doubt to the basic character of pyridine, leaves of Oxalis in the 
pyridine solution do not turn yellow, even when the greater part of the 
electrolytes have passed out of the cell. In the solution of amyl alcohol, on 
the other hand, the leaves turn yellow almost immediately after immersion 
in the solution. 
The numbers obtained in the experiment described below show this. 
2-5 grm. of leaves of Oxalis acetosella were placed in 50 c.c. of the 
following solutions: 
Pyridine, m. 
Isobutyl alcohol, 0-5 m. 
Isoamyl alcohol, o-2 m. 
The conductivity of the external solution was measured from time to 
time and colour change in the leaves noted. The results obtained are 
given in the following table, and are also shown graphically in Fig. 3. 
Z 4 6 
Time in hours. 
Fig 3. Exosmosis of electrolytes from leaves of Oxalis acetosella. A, in 0*2 m. isoamyl 
alcohol ; B, in 0*5 m. isobutyl alcohol ; P, in m. pyridine. 
