JACQUES LOEB 



403 



senting this influence on the transport of liquid in electrical endosmose 

 through collodion membranes seem to be similar to the curves, repre- 

 senting the influence of different concentrations of the same electro- 

 lytes on free osmosis, which were published in a preceding paper.^ 



In experiments with concentrations of electrolytes above m/512 or 

 m/256 it is wiser to work with a lower voltage to avoid the excessive 

 development of gas bubbles. Table V gives the numbers for the rise 

 of liquid in the manometer for different concentrations of K4Fe(CN)6 



TABLE v. 



Influence of Concentration on Transport of Liquid by Electrical Endosmose 

 to Cathode. 20 Volts. 



m/2,048 K4Fe(CN)5 

 m/1,024 K4Fe(CN)6 

 m/512 K4Fe(CN)6.. 

 M/2S6 K4Fe(CN)6 . . 

 m/128 K4Fe(CN)6 . . 

 M/64K4Fe(CN)6... 



during 15 minutes after the intensity of the current had become 

 fairly constant. The p.d. applied was 20 volts. 



The maximum of transport of liquid in electrical endosmose was 

 reached at a concentration of about m/512 K4Fe(CN)6 and then the 

 electro-endosmotic transport fell rapidly to zero with increasing 

 concentration, although the intensity of the current increased with 

 concentration. The drop in the curves representing the initial rate 

 of diffusion of water from pure water to solution through collodion 

 membranes in the case of free osmosis is therefore paralleled in the 

 case of electrical endosmose (Table V). A fuller account of these 

 results will shortly be published. 



