Mahogany may be said to have come into general use subsequent to 1720, and its introduction is asserted to have been due to the tenacity of purpose of a Dr. Gibbon, whose wife wanted a candle box, an article of common domestic use of the time. The Doctor, who had laid by in the garden of his house in King Street, Covent Garden, some planks sent to him by his brother, a West Indian captain, asked the joiner to use a part of the wood for this purpose; it was found too tough and hard for the tools of the period, but the Doctor was not to be thwarted, and insisted on harder-tempered tools being found, and the task completed; the result was the production of a candle box which was admired by every one. He then ordered a bureau of the same material, and when it was finished invited his friends to see the new work; amongst others, the Duchess of Buckingham begged a small piece of the precious wood, and it soon became the fashion. On account of its toughness, and peculiarity of grain, it was capable of treatment impossible with oak, and the high polish it took by oil and rubbing (not French polish, a later invention), caused it to come into great request. The term "putting one's knees under a friend's mahogany," probably dates from about this time. [Illustration: Kneehole Table, by Sheraton.] Thomas Sheraton, who commenced work some 20 years later than Chippendale, and continued it until the early part of the nineteenth century, accomplished much excellent work in English furniture. The fashion had now changed; instead of the rococo or rock work (literally rock-scroll) and shell (_rocquaille et cocquaille_) ornament, which had gone out, a simpler and more severe taste had come in. In Sheraton's cabinets, chairs, writing tables, and occasional pieces we have therefore no longer the cabriole leg or the carved ornament; but, as in the case of the brothers Adam, and the furniture designed by them for such houses as those in Portland Place, we have now square tapering legs, severe lines, and quiet ornament. Sheraton trusted almost entirely for decoration to his marqueterie. Some of this is very delicate and of excellent workmanship. He introduced occasionally animals with foliated extremities into his scrolls, and he also inlaid marqueterie trophies of musical instruments; but as a rule the decoration was in wreaths of flowers, husks, or drapery, in strict adherence to the fashion of the decorations to which allusion has been made. A characteristic feature of his cabinets was the swan-necked pediment surmounting the cornice, being a revival of an ornament fashionable during Queen Anne's reign. It was then chiefly found in stone, marble, or cut brickwork, but subsequently became prevalent in inlaid woodwork. [Illustration: Chairs, by Sheraton.]