Diffusion of Sodium Chloride. 



H5 



in beakers containing three hundred and fifty cubic centimeters 

 of water. At the end of twenty minutes they were withdrawn 

 and a known volume of the outside fluid titrated for chloride. 



Average Diffusion from Tables X and U 



% Sodium 

 Chloride 



>5 



00.0 



27.0 



24.0 



21.0 



Id.O 



z 



n «5.o 



12.0 



9,0 

 6.0 

 3.0 

















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1 tao 2. 230 0 



Time in minu+ec end seconds 



The following tables enumerate the results of one set of a 

 series of experiments. The drying time of one minute and thirty 

 seconds was the lowest at which membranes which did not cloud 

 could be prepared. 



The least permeable fixed lecithin-collodion membranes were 

 clear. Those of the later drying times were delicately opalescent. 

 This opalescence was more marked when the drying time was 

 increased beyond four minutes. A study of the tables shows that 

 with the change from clearness to opalescence there was a corres- 

 ponding change in the permeability of the membranes. The pure 



