JACQUES LOEB 



663 



ni. 



The next question was as to the minimal concentration of a trivalent 

 cation required to render the membrane positive. For this purpose 



flerrhraine 



;-. 



-t— • 



<d 



o 



to 



<u 



-»— • 



•T— t 

 -•— > 



r— < 



c 



Z048 1024 312 Z56 129 64 32 16 8 



M M 



4 ¥ ^^ 



Concentration o| salts used 



Fig. 3. Showing that Al charges the membrane positively. 



various concentrations of CeCls were prepared, beginning with 

 m/65,536 CeCla. To each of these solutions so much CaClo v/as 

 added that the concentration was m/256 in regard to CaCL. These 



