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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ... fine sandstone, some of iron, others of bnngmg out th= pot. tin or copper; the edges of some are square, or round, or sharp. They are u:ed with sand and water, or emery and water, stone wheels with water only. In a soluble form silicic acid is found in springs, and thus enters into the composition of most plants and grasses, while the shells and scales of "infusoria" consist of silica. As silicate of alumina,--i.e., clay,--it plays a very important role in our porcelain and pottery works. BORON is found in volcanic districts, in lakes as boracic acid, in combination with oxygen. It is a brownish-green, insoluble powder, in a free state, but as boracic acid it is white. It is used to colour fireworks with the beautiful green tints we see. Soda and boracic acid combine to make borax (or biborate of soda). Another and inferior quality of this combination is tinkal, found in Thibet. Borax is much used in art and manufac tures, and in glazing porcelain. (Symbol B, Atomic Weight 11). Selenium is a very rare element. It was found by Bcrzilius in a sulphuric-acid factory. It is not found in a free state in nature. It closely resembles sulphur in its properties. Its union with hydrogen produces a gas, seleniuretted hydrogen, which is even more offensive than sulphuretted hydrogen. (Symbol Se, Atomic Weight 79). TELLURIUM is also a rare substance generally found in combination with gold and silver. It is like bismuth, and is lustrous in appearance. Telluretted hydrogen is horrible as a gas. Tellurium, like selenium, sulphur, and oxygen, combines with two atoms of hydrogen. (Symbol Tc, Atomic Weight 129). ARSENIc, like tellurium, possesses many attributes of a metal, and on the other hand has some resemblance to phosphorus. Arsenic is sometimes...
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