﻿410 Mr. H. D. Murray on Influence of Size of Colloid 



two vessels, one slightly smaller than the other, and fitting 

 by a ground-in joint inside the larger. 



The smaller vessel has a slightly higher inner cylindrical 

 vessel, the base of which is concentric with that of the 

 outer vessel and fused to it. The electrolyte solution is 

 placed in the inner vessel and the colloidal solution in the 

 annular space, both having been previously rinsed out with 

 their respective solutions. The larger vessel is placed over 

 the smaller, and the whole inverted and left for 30 seconds 





















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Time in hours- after mixing 



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to drain. By this means a sudden and complete mixing of 

 the two solutions is obtained. The mixed solution is then 

 poured into a vessel of hard glass and corked. The whole 

 apparatus, as were all the vessels with which the mastic 

 solution came in contact, is made of hard glass and was 

 steamed out between each series. 



The experiments were conducted with 10 c.c. of the mastic 

 solution at the required dilution. Into the inner vessel 

 was poured enough water to make the volume of the elec- 

 trolyte solution up to 5 c.c, and then the latter solution 

 was added at a convenient concentration. To determine 



