The diffusion of sodium chloride through a “lecithin”-collodion membrane

Conclusions

I. Changes in the drying time, to four minutes, of membranes prepared from collodion and fixed with water does not appreciably alter their permeability to sodium chloride, whereas membranes prepared under the same conditions containing fifty per cent. of “ Lecithin ” by weight become relatively semi-permeable with decreasing drying times.

II. Changes in the sizes of the aggregates of the lecithin molecules is suggested as a possible influence on the permeability of the leci thin-collodion membranes.