'In a lecture recently delivered by Mr Owen at the Society of Arts, the learned professor detailed the particulars of a highly interesting experiment, which resulted in the establishment of one of the very few instances in which the origination of a distinct variety of a domestic quadruped could be satisfactorily traced, with all the circumstances attending its development well authenticated. We must premise it by stating, that amongst the series of wools shewn in the French department of the Great Exhibition, were specimens characterised by the jury as a wool of singular and peculiar properties; the hair, glossy and silky, similar to mohair, retaining at the same time certain properties of the merino breed. This wool was exhibited by J. L. Graux, of the farm of Mauchamp, Commune de Juvincourt, and the produce of a peculiar variety of the merino breed of sheep, and it thus arose. In the year 1828, one of the ewes of the flock of merinos in the farm of Mauchamp, produced a male lamb, which, as it grew up, became remarkable for the long, smooth, straight, and silky character of the fibre of the wool, and for the shortness of its horns. It was of small size, and presented certain defects in its conformation which have disappeared in its descendants. In 1829, M. Graux employed this ram with a view to obtain other rams, having the same quality of wool. The produce of 1830 only included one ram and one ewe, having the silky quality of the wool; that of 1831 produced four rams and one ewe with the fleece of that quality. In 1833, the rams, with the silky variety of wool, were sufficiently numerous to serve the whole flock. In each subsequent year the lambs have been of two kinds--one preserving the character of the ancient race, with the curled elastic wool, only a little longer and finer than in the ordinary merinos; the other resembling the rams of the new breed, some of which retained the large head, long neck, narrow chest, and long flanks of the abnormal progenitor, whilst others combined the ordinary and better-formed body with the fine silky wool. M. Graux, profiting by the partial resumption of the normal type of the merino in some of the descendants of the malformed original variety, at length succeeded, by a judicious system of crossing and interbreeding, in obtaining a flock combining the long silky fleece with a smaller head, shorter neck, broader flanks, and more capacious chest. Of this breed the flocks have become sufficiently numerous to enable the proprietor to sell examples for exportation. The crossing of the Beauchamp variety with the ordinary merino has also produced a valuable quality of wool, known in France as the "Mauchamp Merino." The fine silky wool of the pure Mauchamp breed is remarkable for its qualities, as combining wool, owing to the strength as well as the length and fineness of the fibre. It is found of great value by the manufacturers of Cashmere shawls, being second