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Although plastics are extremely successful commercially, they would never reach acceptable performance standards either in properties or processing without the incorporation of additives. With the inclusion of additives, plastics can be used in a variety of areas competing directly with other materials, but there are still many challenges to overcome. Some additives are severely restricted by legislation, others interfere with each other-in short their effectiveness varies with circumstances.
The sovereigns of England, unlike those of France, have seldom taken to themselves the task of acting as patrons of the fine arts. Therefore when we write of the "Queen Anne period" we do not refer to the influence of the undistinguished lady who for twelve years occupied the throne of England. The term is merely convenient for the purpose of classification, embracing, as it does, the period from William and Mary to George I. during which the furniture had a strong family likeness and shows a development very much on the same line. The change, at the last quarter of the seventeenth century, from the Jacobean models to the Dutch, was probably the most important change that has come over English furniture. It was a change which strongly influenced Chippendale and his school, and remains with us to this day.