|Of these there was a great variety in the ancient world, some with, and some without, supports for the head and back. The latter sort (Gr. diphros, Lat. sella) were mostly low, and were supported sometimes on four upright legs, sometimes on feet arranged and shaped like a sawing stool (see cuts). The seat being made of leather straps, the chair could, in the latter case, be folded up and carried by a servant. A chair of this kind, made of ivory, was one of the insignia of the curule magistrates at Rome (see SELLA CURULIS). The official chair of the Roman magis trates was always without a back. Stools without backs were also used by mechanics, soldiers, and boys at school. The backed chairs ordinarily in use much resembled our modern chairs. They generally had a sloping back, sometimes arched out in the centre (see cuts). Chairs of this form were made for women and invalids; and the cathedra or professor's chair was of the same description. The Greek thronos and the Latin solium were seats of honour. They were lofty, and had footstools accordingly; the back was high and straight, the legs were upright, and there were arms at the sides. The Roman pater familias, when giving his clients their morning audience, sat in a solium. Seats were not always stuffed, but cushions were put on them, and coverings on the backs. Chairs were made of metal and ivory, as well as of wood.