The slow and difficult process of moulding the separate sheets of paper by hand has, to a great extent, been superseded by the introduction and gradual improvement of the very beautiful machinery of Fourdrinier, referred to in our introductory remarks. By means of this machine, a process which, under the old system, occupied about three weeks, is now performed in as many minutes. Within this brief space of time, and the short distance of thirty or forty feet, a continuous stream of fluid pulp is made into paper, dried, polished, and cut up into separate sheets ready for use. The paper thus produced is moderate in price, and, for a large number of purposes, superior in quality to that which was formerly made by hand. In fact, the machine-made papers can be produced of unlimited dimensions; they are of uniform thickness; they can be fabricated at any season of the year; they do not require to be sorted, trimmed, and hung up in the drying-house--operations which formerly led to so much waste, that about one sheet in every five was defective. The paper-machine moves at the rate of from twenty-five to forty feet per minute, so that scarcely two minutes are occupied in converting liquid pulp into finished paper, a result which, by the old process, occupies about seven or eight days. If the machine produce ten lineal yards of paper per minute, or six hundred per hour, this is equal to a mile of paper in three hours, or four miles per day of twelve hours. The paper is about fifty-four inches wide, and, supposing three hundred machines to be at work on an average twelve hours a day, the aggregate length of web would be equal to 1,200 miles, and the area 3,000,000 square yards. Paper is sent into the market in various forms and sizes, according to the use for which it is intended. The following table contains the name and dimensions of various sheets of paper:-- Inches. Foolscap, 14 by 17 Crown, 15 by 20 Folio Post, 16 by 21 Demy, 17 by 22 Medium, 19 by 24 Royal, 20 by 25 Super Royal, 22 by 27 Imperial, 22 by 32 Medium and Half, 24 by 28½ Royal and Half, 25 by 29 Double Medium, 24 by 38 Do. Super Royal, 27 by 42 Do. Imperial, 32 by 44 Many of the papers above enumerated are made by hand, of the exact size indicated; but, if made by the machine, the roll of paper has to be cut to the required dimensions. In order to do this with precision and expedition, various cutting-machines have been contrived, in which the paper, as it comes from the manufacturing machine, is cut to any size required. HOT-PRESSING, GLAZING, AND FINISHING--STATISTICS.