Hind. — Studies in Permeability. III. 225 
This method gives no definite information as to the absorption of the 
anion. Whether the acid is absorbed as such, or whether the kation and 
anion enter the cell at different rates, is a question at present unsolved. 
The work of Pantanelli and Sella (10) indicates the possibility of this latter 
alternative with its resulting complications. 
The Results. 
I. The Absorption of Acids by Potato Tissue. 
Hydrocldoric Acid. 
Series 1 . — The rapid absorption by plant cells of the hydrogen ion of 
N 
hydrochloric acid in a concentration of has been indicated in previous 
1000 r 
Time in Hours 
Fig. 1. Potato in Hydrochloric Acid. 
papers (12, 13). In the present investigation a wide range of acid con- 
N q N 
centrations was employed, varying from to 1 
1000 
50000 
The curves 
shown in Fig. 1 indicate that a marked decrease in the electrical conductivity 
of the acid solution occurs with all strengths of acid except the very dilute 
ones. In all cases examined, the conductivity rose after a time. These 
curves indicate that in all cases a rapid absorption of acid by the potato 
