dealing with the Phenomena of " Clot " Formations. 367 



Table IV. — Erosion of Gels (measured in mm.) containing Dextrose by 



Sodium Chloride Solutions. 



Concentra- 









Concentration of sodium chloride. 









tion of 

























dextrose 

























in gel. 



0. 



N/20. 



2N/20. 



3N/20. 



4N/20. 



5N/20. 



6N/20. 7N/20. 8N/20. 9N/20. 



ION/20. 



3 N/8 



13 



14 



18 



37 



49 



49 



51 



69 



57 



41 



40 



N/8 



13 



22 





35 



31 



24 



20 



20 



20 



21 



24 



Antagonistic Action of Calcium Chloride to Sodium Chloride. 



Experiments were undertaken to ascertain the amount of calcium chloride 

 necessary to antagonise the erosive action of sodium chloride solutions of 

 various concentrations. It will be observed from Table V, in which the 

 results of these experiments are recorded, that the erosion produced in a gel 

 (containing N/8 KC1) by a concentration of 3N/20 sodium chloride is about 

 equal to that produced by the concentration 8N/20, when no calcium chloride 

 is added to the eroding solutions. It was found that somewhat higher 

 concentrations of calcium chloride were necessary to produce complete 

 protective action against the 8N/20 solution than were required in the case 

 of the 3IST/20 solution of sodium chloride. Nevertheless, the ratio of calcium 

 salt to sodium salt necessary to inhibit erosion within the " zone of 

 instability " was larger than that which was required to produce complete 

 antagonism in the region of the second phase of the erosion curve. 



Table V. — Antagonistic Action of CaCl2 to various Concentrations of NaCl. 



Gel. 2 c.c. 4-per-cent. sodium cholate + 0'5 c.c. 3N/10 CaCl 2 + l - 5 c.c. N/3 KC1. 







Amounts 



of erosion (in millimetres). 





Concentra- 













tion of 













NaCl. 



In absence 



In presence of 



In presence of 



In presence of 



In presence of 





of CaCl 2 . 



N/124 CaCl 2 . 



N/64 CaCL. 



N/32 CaCl 2 . 



N/16 CaCL,. 



2N/20 



18 



6 



5 



3 







3N/20 



37 



6 



4 



3 







4N/20 



44 



7 



4 



2 







5N/20 



2L 



6 



4 



3 







6N/20 



14 



7 



5 



2 







7N/20 



17 



12 



4 



» 3 







8N/20 



35 



22 



5 



4 







9N/20 



39 



26 



8 



4 



e 



Finally, the action of various sodium salts '(organic or inorganic) on 

 cholate gels was investigated. When the gel was made in the ordinary 



