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56 INTERNATIONAL EXHIBITION, 1876. nately over two threads and one thread of the warp, making a “ rep” or corded tissue. Still other variations are made by the different materials of the warp and weft, by having them of pure wool and of a single color, or mixed with silk, mohair, or China-grass, or by having the threads printed in different tints. The four fundamental regular interlacements before described, which form the base or ground of even the most complicated tissues, are further varied by having combinations of crossings of the threads which occur at variable places at each course of the thread across the web, forming figured, brocade, or damasked effects, which are produced by the Jacquard loom. Another variation is made by having two warps, one to form the ground of the tissue, and the other made to pass over wires to form a loop, making the velvet or pile fabrics. There are still to be added the highly-important differences of character, equally obvious to the touch and the eye, produced by the character of wool used, whether fine and soft (like merino and cashmere), or hard and lustrous (like English combing-wool and mohair). These remarks will enable the reader more readily to understand the classification of fabrics condensed from M. Alcan (the highest authority upon this subject), and published in his treatise on working wools, in 1866. As the American importation of worsted dress goods is principally from France, the catalogue is not less valuable because limited to French fabrics. For the same reason the French names are retained.