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25under load, and, like the water-stretched bundle, this was retained after drying and load removal. The contraction in length usually observed on placing fibers in such reagents did not occur, presumably because of the slight tension initially placed on the bundle to provide sufficient stability for observations. In every case, the elongation introduced by tensioning in the reagent exceeded that produced in the dry bundle.Literature Cited 1. deGruy, I.

An apparatus is described for measuring yarn softness in terms of the percent increase in yarn width when the yarn is subjected to lateral pressure between two parallel plane surfaces. Softness data obtained on a family of 31/2 cotton yarns have been presented as a contour diagram which, in connection with similar contour diagrams of other important yarn properties, shows the interrelationship of these properties over a wide range of single and ply twist combinations.

The alkali-centrifuge value (ACV) of cotton fibers is a quantitative measure of sorption from 15% NaOH solution. and reflects the fibers' swelling capacity. The ACV decreases when fiber swelling is restrained by a cross-linking agent. Cotton yarns, cross-linked with dimethyloldihydroxyethyleneurea (DMDHEU) to different contents by four different processes, had ACV's ranging from 260 to 160; the value for the noncross-linked control was 253. The caustic and the moisture sorptions depended upon the extent and nature of the reaction with the reagents. The cross-linking of cotton with DMDHEU, alone or in conjunction with Aerotex Resin Sp. (methylated methylol melamines) and the action of a caustic solution on the cross-linked structure seemed to be very complex. The properties of the cross-linked product depended upon many factors, such as preparatory process, content and distribution of the cross links, susceptibility of the cross links to a chemical, etc.