366 Mr. S. B. Schryver and Miss M. Hewlett. Investigations 



salts, and the curves representing the action give indications of the same 

 diphasic character. The action of sodium chloride solution on gels 



80 



O 











LCI 































NaCl/ 









Nac: 













£kci 





















MgC> 



























KC1 













LCI 











































Z2U 2>]L- ^Ny 

 -"20 -"20 ^20 ^20 



5^- 6j\> IK- 8JV> 

 ^20 ^20 ^20 -"20 



Concentration of solutions 



Fig. 2. 



<20 -"20 



Table III. — Erosive Action (measured in mm.) of Sodium Chloride Solutions 

 on Cholate Gel containing Varying Concentrations of Potassium Chloride. 



Concen- 









Concentration of NaCl solutions. 









tration 























of KC1 























in gel. 



N/20. 



2N/20. 



3N/20. 



4N/20. 



5N/20. 



6N/20. 



7N/20. 



8N/20. 



9N/20. 



10N/20. 



N/12 ... 



16 



16 



27 



17 



14 



16 



28 



44 



52 



59 



N/8 



18 



18 



28 



40 



26 



12 



18 



28 



38 



47 



N/6 



19 



24 



47 



56 



44 



20 



14 



20 



30 



37 



Erosion in water 14. 



containing dextrose is illustrated by Table IV. The gels were made from the 

 following mixtures :— 



2 c.c. 4-per-cent. sodium cholate + 0'5 c.c. 3 N/10 CaCl 2 + 1"5 c.c. N dextrose. 

 „ ,, ,, „ „ 1"5 c.c. 3N/D „ 



The concentration of dextrose in the gels was, therefore, 3N/8 and 1ST/8. 



