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    Abstract

    LONDON. Royal Society, Mar. 6.—W. J. Elford: Structure in very permeable collodion gel films and its significance in filtration problems. Optical studies have revealed two definite types of structure: (i) microgel structure of microscopic order, (ii) ultragel structure of ultra-microscopic order. Gelation here is a process of phase transition resulting from the coagulating influence of desolvation. The nature and stability of the gel is a function of the specific characters of the nitrocellulose and solvent, and the variation in free surface forces around the dispersed phase particles with differing degrees of molecular complexity of the system. A complete explanation of the general behaviour of ultra-filter membranes is afforded.—T.W.Wormell:

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