METHODS OF COLLOID RESEARCH 



93 



plate, water flows and bathes the extensive dialyzing surface of the 

 dialyzer A. 



JORDIS has constructed an apparatus resembling a filter press for 

 dialyzing large quantities. A number of wooden rings are soaked in 



f 



FIG. 12. Tube for the preparation of 

 collodion sacs. (G. Malfitano.) 



FIG. 13. Star dialyzer. (R. 

 Zsigmondy.) 



paraffin and then both surfaces are covered with parchment. These 

 rings are placed in an apparatus G so that between each ring with 

 parchment there is one without parchment. They are made tight 

 with rubber washers. The individual elements of the filter are 



Perforation 



Wooden Ring, I cm. thick ^jfr 



W= Running Water 

 D= Dialysing Spaces 



FIG. 13a. Continuous dialyzing apparatus of E. Jordiss. 



Reproduced from Zeitschrift fur Electrochemie, p. 677, Vol. VIII, 1902. 



pressed together with wing nuts so that they are water-tight. The 

 solution to be dialyzed is placed in the rings covered with parch- 

 ment, the water in the intervening rings circulates through holes 

 made in them for the purpose, see Fig. 13a. 



