JACQUES LOEB 



399 



tensity of the current in milliamperes, and the rise in the level of the 

 liquid in the glass tube. 



In the case of m/512 KCl the current became approximately con- 

 stant after 15 minutes (2,1 to 2.2 milliamperes) and the rise in the 

 level of liquid in the glass tube between 15 and 30 minutes, i.e. 7 — 

 3.5 mm. = 3.5 mm., was used as a measure for the relative influence of 

 m/512 KCl (approximately neutral) upon the rate of endosmotic 

 transport of liquid. 



The figures for transport during 15 minutes were selected as follows: 

 for M/512 K2SO4 = 10.5 - 4= 6.5; for m/512 K4Fe(CN)6 = 45 - 25 = 

 20; etc. 



Since in the case of m/512 K4Fe(CN)6 the intensity of the current 

 was greater than in the experiments with KCl or K2SO4, an experi- 

 ment with m/1,024 K4Fe(CN)6 is added in the table. It gave 48 - 

 26 = 22 mm. as the transport number though the intensity of current 

 was almost as low as in the case of m/512 K2SO4 or m/512 KCl. 



Experiments with neutral solutions of salts with bivalent cation, 

 like CaCl2, BaCU, gave no transport with electrical endosmose even 

 with 100 volts and an intensity of current of 4.8 miUiamperes. Table 

 II gives the transport numbers for various approximately neutral 

 solutions. 



