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n coins at a distance, and tell what was passing seven miles off. Such is the claim in his son's book, second edition, published in 1591. Jansen (about 1608), a spectacle-maker of Middleburg, Holland, was struck by the effect of a concave and a convex lens held in the proper relation and distance. For the purpose of observation, he fixed the glasses on a board in proper position, and afterwards in a tube. He seems to have considered it interesting but not valuable, and Prince Maurice of Nassau became possessed of it. Lippersheim, also of Middleburg, seems to have been concerned in it in some way. Another claimant of the invention about the same date is Metius, who was a glass-cutter, and casually observed the effect of a concave and convex lens held in line in the hands. The three latter claimants had their supporters as the authors of the invention. Descartes, who lived near the time, supported the claims of Metius. Borelli, about 1650, examined the question, and decid
es, in 1517. The exact conformity of different copies of the book taken by Faustus for sale in Paris gave rise to the report of his being in league with Satan, and was the origin of the popular story of his attendant demon. The Mentz printers, in order that the art might not be divulged, administered an oath of secrecy to all whom they employed; this appears to have been strictly adhered to until the year 1462, at which period the city was sacked and plundered by Archbishop Adolphus of Nassau; its former rights and franchises were also abolished. Amid the consternation occasioned by this extraordinary event, the workmen of the Mentz press, considering their oath of fidelity no longer binding, spread themselves in different directions. By this circumstance the hitherto great mystery was rapidly carried through a considerable portion of Europe; and the places which received it early, after some time commenced a contention for the merit of the discovery. Laurentius Zanssen, sur
re accidents. After the slates are detached by powder or otherwise, they consume considerable labor in splitting them with wedges and mallets into marketable sizes, and reducing them to the several grades required for roofing and other purposes. Slate adapted for ordinary economic uses is not very common. A number of varieties are, however, found in Cornwall, Wales, Scotland, and Ireland, and also on the Continent of Europe. Those from the Ardennes, from Angers on the Loire, and from Nassau, are largely exported. In this country, Vermont furnishes slates of unsurpassed quality and beauty. Their quarrying and manufacture are beginning to constitute an important feature of national industry, promising large increase in the future. Aluminous slate yields alum. Adhesive slate is porous and adheres readily to the tongue. Bituminous slate yields coal-oil. Whet slate has a fine grain and makes hones. A tough kind, hornblende slate, is used for flagging and sidewalks
gue-holding forceps. d, Tiemann's uvulatome. b, vulsellum. e, Green's double hook. c, uvula-scissors with claws. Vac′ci-nator. (Surgical.) An instrument for introducing vaccine virus beneath the skin. The puncturing-tube, with virus in its aperture, is pressed through the skin, and the virus driven into the wound by the force of the spring when the trigger is pushed in. The king of Prussia has commanded his army to be inoculated [vaccine matter], and it is believed that Nassau and Bavaria will compel a universal inoculation in their dominions. Exterminating the small-pox and annihilating the little princes and states of Germany, are the two great projects of the reforming part of Germany. — Monthly Magazine, London, May 1, 1801. Inoculation, which, prior to the great discovery of Jenner, was regarded as the best protection against the horrors of the small-pox, was practiced in China at a very early period, and probably found its way to Europe by the same secre<