. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. PROFESSIONAL PAPER April 24,1916. MANUFACTURING TESTS OF COTTON FUMIGATED WITH HYDROCYANIC-ACID GAS. By William S. Dean, Assistant in Cotton Testing. CONTENTS. Introduction Spinning tests Stock of cotton Methods of comparison. Waste percentages Moisture tests Spinning qualities Tensile strength Single thread test Chemical laboratory tests Bleaching of raw cotton Description of further test Test for presence of hydrocyanic acid. Bleaching of yams Dyeing of yarns Direct dyes Basic dyes Mercerizing of yu
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. PROFESSIONAL PAPER April 24,1916. MANUFACTURING TESTS OF COTTON FUMIGATED WITH HYDROCYANIC-ACID GAS. By William S. Dean, Assistant in Cotton Testing. CONTENTS. Introduction Spinning tests Stock of cotton Methods of comparison. Waste percentages Moisture tests Spinning qualities Tensile strength Single thread test Chemical laboratory tests Bleaching of raw cotton Description of further test Test for presence of hydrocyanic acid. Bleaching of yams Dyeing of yarns Direct dyes Basic dyes Mercerizing of yums Conclusion INTRODUCTION. The spinning tests herein described were suggested by a joint com- mittee of cotton manufacturers and officials of the Federal Horticul- tural Board, who met and discussed plans of preventing the intro- duction into the United States of the pink boll worm^ with the im- portations of foreigTi-grown cotton. As hydrocyanic-acid gas had been found by that Board to be a practicable and successful fumi- gating agent ^ in the destruction of these pests, even though the larvae were in the center of a compressed bale of cotton, it was decided that manufacturing tests should be made to determine whether the fumi- gation by this agent would cause any injury to the cotton fibers. SPINNING TESTS. The manufacturing tests were conducted by the United States Department of Agriculture, under the direct supervision of the Office of Markets and Rural Organization. Through the courtesy of the president and manager the tests were made at the New Bedford 1 Hunter, W. D., The Pink Boll Worm. Unnumbered publication. U. S. Department of Agriculture, Bureau of Entomology, August, 1914. " For a description of this method of fumigation see TJ. S. Department of Agriculture, Federal Horticultural Boai'd. Service and regulatory announcement No. 21, 1915. Note.—This bulletin should be of interest to manufacturers and dealers in foreign-grown cotton and cotton yarns, also ind
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