A method is described which classifies as thin-walled only 10 to 15 percent of the fibers in normal American Upland cotton instead of the 30 percent usually found by the ASTM caustic-soda method. From studies of neps this appears to be a more reasonable standard and the author's experience has shown that it is one on which different operators can agree more readily and to which they adhere more consistently than to the artificial criterion of a two-to-one lumen-to-wall ratio called for by the ASTM method.
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