Electric Telegraph 169 Steam-Engines 171 Mills 195 Saw-Mills 211 Forks 214 Music 219 Sealing-Wax, Seals, &. 228 Black Lead Pencils 234 Coloured Glass 236 Etching on Glass, and Glass-cutting 240 Hydrometers 246 USEFUL INVENTIONS. PRINTING. Among the many arts and sciences cultivated in society, some are only adapted to supply our natural wants, or assist our infirmities; some are mere instruments of luxury, calculated to flatter pride, to gratify vanity, and to satisfy our desires of every description; whilst others tend at once to secure, to accommodate, delight, and give consequence to man. Of this latter kind, Printing undoubtedly stands pre-eminent; and if viewed in its full extent, it may be truly said to possess a very considerable portion not only of the comforts, but the conveniences and positive utilities of life. The advantages derived from this invention must be acknowledged by all,--this art has proved the principal step towards civilization: by it has Christianity been propagated; and by its powerful means are we made acquainted with all that is useful in knowledge, in art, and science. It would take the pen of an inspired writer to enumerate all the blessings which flow from it. It is a patent engine which possesses a preponderating influence over the mind of man either for good or evil, according as it is used.