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It is said that the best reeds for the purpose formerly grew near Memphis, on the Nile; near Cnidus of Caria, in Asia Minor; in Armenia and in Italy: those of the latter being of relatively poor quality. A place yet famous for them, and which may have supplied the ancient demand in part, is in the vicinity of the Persian Gulf, in a large fen or tract of soggy land supplied with water by the river Helle, a place of Arabia formed by united arms of the Euphrates and Tigris. They are cut in March, tied in bundles, laid six months in a manure-heap, where they assume a beautiful color, mottled yellow and black. (Chardin.) Tournefort saw them growing in the neighborhood of Teflis in Georgia. Miller describes the cane as growing no higher than a man, the stem three or four lines in thickness, and solid from one knot to another, excepting the central white pith. The incipient fermentation in the manureheap dries up the pith and hardens the cane. The pens are about the size of the larg
mpt at the reproduction of carbon prints was made for thirty-five years after his time. In 1829, M. Niepce associated himself with M. Daguerre, and no doubt contributed much to the latter's beautiful process. In the year 1834, Mr. Fox Talbot began the investigations which finally resulted in a valuable working process. On the 31st January, 1839, six months prior to the publication of M. Daguerre's process, Mr. Fox Talbot communicated his photographic discoveries, and in the following February he published a description of his method, to which, as afterwards perfected, he gave the name of calotype. He prepared a sheet of paper with iodide of silver, by treating it alternately with solutions of nitrate of silver and iodide of potassium. When dry, and just before use, he covered the surface with a solution of nitrate of silver and gallic acid, and dried it again, by which means he greatly enhanced its sensitiveness. A very brief exposure of paper so prepared to light produced an
otable exceptions, attar gul, or attar of roses, and eau-de-cologne. See Morfit's Perfumery, Philadelphia, 1853. Per′get-ing. See Pargeting. Per′i-a′gua. A canoe formed by hollowing out a single log or by joining two logs correspondingly hollowed out. A dug-out. Per′i-er. (Founding.) A metal-founder's iron rod for holding back the scum in the ladle. Pe′ri-od. The full stop (.) which marks the end of a sentence in punctuating, or indicates an abbreviation, as Mr., Jan., B. C., etc. Pe-ri-od′o-scope. (Surgical.) An instrument for determining the date of menstruation, labor, etc., and for other calculations. Peri-os′te-um-el′e-va-tor. (Surgical.) A device for loosening and raising the periosteum out of the way of an instrument in making exsections, etc. Per′i-scop′ic lens. (Optics.) Dr. Wollaston's periscopic lens for microscopes had two plano-convex lenses ground to the same radius, and between their plane surface
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