226 
Hind.— Studies in Permeability. III. 
cells takes place, but in the case of the lowest concentrations of acid the 
increase of conductivity due to the electrolytic exudate from the cells more 
than counterbalances the decrease, owing to removal of hydrogen ions by 
the potato tissue. This influence of the exudate on the conductivity curves 
makes itself obvious after a time in the case of the higher strengths 
of acid. 
Time in Hours 
Fig. 2. Potato in Nitric Acid. 
chloric acid was obtained by the electrometric measurement of the change 
in hydrogen-ion concentration of the solution. Experiments were carried 
N N N 
out with acid of concentrations 
In all cases there was 
IOOO 2COO 5000 
a rapid absorption of hydrogen ions, as already indicated for the case of 
N . . r , . 
acid in previous papers of this series. 
IOOO 
