5 1 Stiles and J0rgensen . — Studies in Permeability . IV. 
hours, and then the rate of exosmosis rapidly falls off until the quantity of 
electrolytic exudate remains constant, which means that equilibrium has 
become established between electrolytes in the external solution and the 
plant tissue. The rate of exosmosis during the first period does not vary 
greatly with the weight of tissue, being practically proportional to the 
Fig. i. The exosmosis of electrolytes from various quantities of potato in molecular solutions 
of pyridine. 
surface. There is, however, a very great difference in the final value of the 
conductivity when different weights of tissue are used. The following table 
shows the relation between the final value of the conductivity and the 
weight of tissue used. The numbers in the third column have been obtained 
by assuming that when equilibrium is obtained there is the same concentra- 
tion of electrolytes in the solution and the tissue. 
