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London): I was very interested in Dr. Stainsby's result that the rigidity of gelatin gels did not vary much with molecular weight, because about 30 years ago I produced a mechanical model for a gelatin gel (Trans. Furuduy Soc., 21, 114 (1925-1926)) which indicated that the rigidity should not be dependent upon molecular weight and that by inference such small variations as are observed are due to secondary effects. (London): Somebody was interested in the details of the method for determiniig rigidity and I would like to mention that they will be published in the Proceedings of the International Congress of Rheology, held this year a t Oxford. Dr. G . Stainsby

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Light‐scattering and viscosity measurements have been performed on nylon 66 fractions dissolved in an ideal solvent. The relation between intrinsic viscosity and weight‐average molecular weight in this solvent is [η] = 19.2 × 10−4 Mw1/2, which indicates that nylon 66 obeys random coil statistics in solution. The unperturbed coil dimensions are given by the parameter (r02/M)1/2 = 96 × 10−10 cm. mole1/2 g.−1/2.

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