In this state they are acted upon by the tangential forces due to the clinging action of the adjacent fibres and are thus able to disturb their orderly alignment of the latter.' This produces unevenness in the structure of the yarn which is mainly responsible for irregularity and deficiency in yarn strength and for abnormal breakages in the winding frame and the loom. [...] The second alternative is to select those fibres in a representative sample which are shorter than a certain fraction of some quantity representing the staple length of the cotton and to express the irregularity as the percentage ratio of the weight of such fibres to the weight of the sample. [...] On the other hand the fibre-length distribution has generally a negative skewness the skewness increasing with the staple length of the cotton so that the modal length is usually somewhat greater than the mean fibre-length. [...] The fibre-length irregularity denoted hereafter by K is defined as the percentage ratio of the weight of all those fibres in a representative sample whose individual lengths are less than three-fourths of the modal length to the weight of the sample. [...] III—DISCUSSION We shall first discuss the results obtained by the application of this method and their bearing upon the physical properties and the spinning capacity of cotton and will then compare this method with an earlier one described by Miss Clegg in the Journal of the Textile Institute.3 An examination of the values of K given in column 6 of Table II may incline one to suspect that the pro
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