The felts are accordingly removed, and one sheet being laid upon another, the heap is subjected to a moderate pressure. When the paper is taken out of the press, it is separated into small parcels of seven or eight sheets in each, for the purpose of drying. The drying is conducted in extensive lofts in the upper parts of the mill. The sheets are taken up upon a piece of wood, shaped like a T, and hung upon hair lines stretched across large horizontal wooden frames, called _tribbles_, and as these are filled they are lifted up between upright posts to the top of the room, and retained by pegs put into the posts; another frame is then filled, and put up in its turn, until the loft is filled. Air is admitted to the lofts by means of louvre boards. When sufficiently dry, the paper is taken down, and _sleeked_, _dressed_, and _shaken_, to get rid of dust, and to separate the pages. It is then laid in heaps in the warehouse, preparatory to sizing. The size is made from the shreds and parings of leather and parchment; it is nicely filtered, and a little alum added. A number of sheets are then dipped into the size and separated, so as to expose both surfaces of each sheet; the sheets are taken out, turned over, and dipped a second time. About a dozen handfuls being thus dipped, they are made into a pile, with a thin board or felt between every two handfuls, and pressed to get rid of superfluous size, which flows back into the size vessel. The paper is again transferred to the lofts, and dried. This being complete, it is taken down, carried to a building called the _Saul_ (probably a corruption of the German _saal_, or the French _salle_, a hall, or large room), where it is _examined_, _finished_, and _pressed_. The imperfect sheets are removed. The press called the _dry-press_ is a powerful one, or the hydrostatic-press is used. After one pressing, the heaps of paper are _parted_; that is, they are turned sheet by sheet, so as to expose new surfaces: the press is again used; then there is another parting, and so on, several times. The paper is next made into quires and reams, and once more pressed. Connected with the sizing of papers is the blueing, which is said to have originated in the suggestion of a paper-maker's wife, who thought that the practice of improving the _color_ of linen while passing through the wash, by means of a blue bag, might also be advantageously applied to paper. A blue-bag was accordingly suspended in the vat; and the effect proved to be so satisfactory that it led to the introduction of the large and important class of blue writing-papers. It was soon found that smalt gave a better color than common stone-blue; and smalt continued to be used for many years; but when artificial ultramarine came to be manufactured at a very low cost, and in a great variety of tints, this beautiful color gradually superseded smalt in the manufacture of writing-paper. PAPER-MAKING BY MACHINERY.