588 



REVERSAL OF SIGN OF CHARGE 



Collodion membrane treated vifti egg albumin 



CO 



c 

 o 



• •.—I 



to 



340 



320 



300 



280 



260 



240 



220 



200 



180 



160 



140 



120 



100 



60 



60 



40 



20 







isoelectric 

 point 4.8 



Fig. 4. Collodion membranes treated with egg albumin. Reversal of sign of charge 

 of membrane at pH near 4.0, on the acid side of the isoelectric point of egg albumin. 



