on various kinds of membranes, their permeabilities and properties. Brown1 has shown that membranes allowing dialysis in almost any sort of solvent, even such as alcohol, acetone, glacial acetic acid, toluene, benzene, etc., can be made. This indicates that pervaporation and ultrafiltration are by no means limited to aqueous solutions. summary. A new form of ultra-filter has been described which depends on pervaporating both the dialysate and the diffusate solutions during dialysis. Its

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... ss in biological and synthetic organic chemistry for the removal of humus, coloring matter and colloids in general, has been pointed out and illustrated. The apparatus makes it possible now, for the first time, to dialyze quantitatively.