It is mainly owing to the differing systems of measurement that the English and American designs are so widely separated; extreme depth with a minimum breadth in the first, and broad, shallow vessels in the latter. It must be said, however, that sailing conditions had quite as much influence in dividing the types as measurement, but in the new compromise design all differences are happily united, and, be the water rough or smooth, the weather light or heavy, the new types will answer all requirements of speed or seaworthiness. The present idea of measurement that embraces sail-area and length is without question a very sensible one--surely, indeed, the best yet devised--but the tables of allowance cannot make just equality between vessels of widely different size, nor do they make just allowance between yachts of varying size in or under all conditions of wind. A system of measurement that will conduce to the construction of vessels of normal design and rig, and a table of allowance that will equalise yachts in any force of wind and condition of sea, are desiderata most devoutly wished for by all who are interested in the development of the yacht, and especially in racing. The sail of a yacht is such an essential factor in its performance that some words respecting makers of duck and of the sails themselves are not out of place. The quality of duck as to evenness of the spinning and weaving of the component yarns, and also the equality in the staple itself, are both factors of the utmost importance when the ultimate 'set' of the sail is considered. These inequalities in material, in conjunction with the personal differences of the men employed in sewing, all combine to make the set of the sail a very unknown quantity, and the differences can be removed only by the utmost care in making duck and in selection of sewers. A wholly satisfactory setting sail is a very rare sight on an American yacht, mainly on account of the uncertain characteristics of the duck, and only within the last year, as a result of the highly commendable efforts of Mr. Adrian Wilson, of the firm of Wilson & Silsby, sailmakers of Boston, has duck been produced that can stand comparison with that made in England for the exclusive use of Lapthorn. The thanks of all earnest yachtsmen are due to Mr. Wilson for his interest and untiring labours in inducing the makers of yarn and weavers of duck to produce an article that will meet the difficult requirements of a racing sail. Wilson & Silsby of Boston and John Sawyer & Co. of New York are considered the best sailmakers in America; but many others enjoy a good reputation: and now that really good duck can be obtained, it is hoped that better setting sails will be more easily obtained than heretofore. [Illustration: 'Constellation,' 1889, New York Club. Designed by E. Burgess.]