_Dryer._—No. 2.—For news and poster ink. Spirits of turpentine 1 qt., balsam copaiba 6 oz. Add a sufficient quantity to the ink to thin it to a proper consistency for working. * * * * * _Silvering Solution for Electrotype Plates._—Nitrate of silver 2 drachms, distilled water 37 drachms. Dissolve and add sal ammoniac 1 drachm, hypophosphate of soda 4 drachms, precipitated chalk 4 drachms. Agitate the preparation occasionally for twelve hours, when it will be ready for use. Apply with a piece of fine sponge. * * * * * _How to coat Electrotypes with Silver._—Electrotypes can be coated with silver (for working with red ink) in the following manner: One part copper, 5 parts pure tin; this alloy to be granulated, not too fine, and mixed with water and cream of tartar into a paste. To each 200 parts of the granulated alloy add 1 part oxide silver, the electro is then laid in it, and boiled for a short time, when it will be found to be beautifully plated. Fresh oxide must be added from time to time. This coating is quite equal in durability to silver or tin. * * * * * _To soften Leather Belting._—Castor oil is a good article for keeping leather belting soft and pliable. * * * * * _How to open a Ball of Twine._—A ball of twine, if opened from the inside, will run off easily enough and give no trouble in the untwining; but if begun from the outside, it will speedily get tangled and knotted. * * * * * _To prevent Adhesion._—M. GARDE, in _l’Imprimerie_, tells paper-makers how to obviate the inconvenience of the adhesion together of sized papers, on damping, by the coagulation of the size. This is effected in the mills, by dipping the sheets in a solution of alum or tannin. A secondary advantage obtained is that the paper becomes tougher. * * * * * _To detect ground Wood in Paper._—Mix three parts of strong nitric acid with one part of sulphuric acid: a drop of this solution will immediately turn paper containing an admixture of ground wood a brown colour. * * * * * _French Gold Printing._—French copal varnish 1 oz., mastic varnish ¼ of an oz.; mix together and add twenty drops to the black ink table, and distribute; take an impression and apply, with wool, gold leaf, Dutch metal, or bronze. Apply the bronze with cotton wool and rub _hard_ over the black ink. After each fifty printed, wipe off the superfluous gold from the type with a silk handkerchief. * * * * * _Transfer Varnish._—Take equal quantities of fir balsam and spirits turpentine. Mix, shake well, and set in a warm place until clear. Used in decalcomania, and for maps, prints, drawings, and other articles of paper; and also to prepare tracing papers, and to transfer engravings. * * * * *