dealing with the Phenomena of " Clot" Formations. 363 



Tour gels were prepared from the following series of mixtures : — 



2 c.c. 4-per-cent. sodium cholate + - 5 c.c. 3 N/10 CaCl 2 + L5 c.c. N/3 LiCl. 

 „ „ „ „ „ 1-5 c.c. N/3 NaCl. 



1-5 c.c. N/3 KC1. 

 1*5 c.c. N/3 MgCLj. 



The concentration of calcium chloride in the mixtures, therefore, was 

 3N"/80 and of the added salts jST/8. The mixtures were introduced into 

 U-tubes of about 3 mm. internal diameter, and clotted by heating for \ hour 

 in a thermostat at 50°. The tubes were then removed from the thermostat, 

 and cut into lengths of 75 mm., which were introduced into a series of Petri 

 dishes containing 20 c.c. of the different salt solutions of varying concen- 

 trations. After 17 hours, the tubes of gel were removed and the amount of 

 erosion was measured. The experiments were carried out at room 

 temperatures. The numbers given in Table I, which represent the amount 

 of erosion in millimetres, are not strictly comparable, as the experiments of 

 each gel were carried out at different times and at slightly different 

 temperatures. All the experiments with each individual gel were, however, 

 carried out at the same time. 



Table I. — Erosion of Gels (in millimetres) containing Different Salts (in 

 Concentrations 2ST/8) when Immersed in Eroding Salt Solutions of 

 Varying Concentrations. 



Salt 



Salt in 





Concentrations 



of the salt in 



sroding solutions. 





























added to 



eroding 























gel. 



solution. 



N/20. 



2N/20. 



3N/20. 



4N/20. 



5N/20. 



6N/20. 



7N/20. 



8N/20. 



9N/20. 



10N/20. 





LiCl ... 



15 



39 



56 



68 



46 



28 



17 



20 



21 



26 





NaCl ... 



14 



24 



38 



19 



18 



25 



34 



50 



70 



>75 



LiCl «| 



KCl ... 



16 



19 



21 



17 



20 



27 



38 



52 



72 



>75 





MgCL ... 



12 



36 



31 



22 



16 



22 



30 



37 



42 



46 





LiCl ... 



15 



43 



64 



69 



69 



61 



57 



26 



19 



20 





NaCl ... 



15 



33 



53 



44 



19 



19 



22 



34 



48 



66 



NaCl | 



KCl ... 



18 



18 



32 



22 



16 



14 



22 



32 



43 



55 





MgCL ... 



11 



34 



34 



34 



26 



14 



20 



28 



38 



38 





LiCl ... 



16 



45 



62 



73 



72 



66 



63 



51 



18 



20 





NaCl ... 



14 



31 



52 



50 



23 



18 



22 



35 



48 



56 



KCl | 



KCl ... 



19 



20 



24 



24 



18 



19 



25 



35 



50 



65 





MgCL ... 



10 



29 



30 



35 



27 



13 



20 



29 



35 



40 





LiCl ... 



44 



73 



75 



75 



73 



58 



32 



23 



23 



17 





NaCl ... 



30 



50 



49 



30 



16 



18 



20 



32 



47 



62 



MgCL | 



KCl ... 



35 



40 



32 



20 



16 



18 



23 



35 



45 



64 





MgCl 2 ... 



42 



50 



50 



45 



18 



16 



20 



32 



45 



50 



The amount of erosion of the various gels 



in water lay between 12 and 14 mm. 



