“Colloid Chemistry” | Nature

REFERRING to the review of vol. 1 of “Colloid Chemistry: Theoretical and Applied”, which appeared in NATURE of October 23, p. 585, three references to electrodialysis are given in the book

on p. 937, ultrafiltration dialysis is treated on p. 832, and electro-ultrafiltration on p. 834 et seq., where a foot-note states that Dr. P. H. Prausnitz' paper on electroosmosis (Graf

Botha Schwerin, etc.) will appear in vol. 3. It has so many descriptions of practical applications, that it justly belongs in the volume on technology. Diffusion is, furthermore, treated in

the latter part of Svedberg's paper on centrifugal and diffusion methods for the study of dispersity and hydration in sols, and in papers by Liesegang, Brad ford, and Holmes; and as

Liesegang says, p. 784, “dialysis is practically the same thing as diffusion in jellies, only it permits us to recognise more distinctly the processes going on inside of the membrane”. It

would seem, then, that dialysis has more than “casualmention in two places”, and that electrodialysis is not “neglected”, even though neither is given elementary discussion.

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