Useful Knowledge Or a Familiar Account of the Various Productions of Nature M
Useful Knowledge Or a Familiar Account of the Various Productions of Nature M
Bingley William
The book Useful Knowledge Or a Familiar Account of the Various Productions of Nature M was written by author Bingley William Here you can read free online of Useful Knowledge Or a Familiar Account of the Various Productions of Nature M book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Useful Knowledge Or a Familiar Account of the Various Productions of Nature M a good or bad book?
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Obsidian is found near Mount Hecla, and in other parts of Iceland. Sir George Mackenzie, during his journey through that island, observed an immense mass of this substance, which appeared to him to have been PUMICE. AZURE STONE. 67 part of a stream that had flowed from a volcano. It is also found in Sicily, and several other islands of the Mediterranean ; and in nearly all parts of the world where there are volcanoes. 108. PUMICE is an extremely light and porous mineral, of somewhat fibrous tex...ture, and of white, grey, reddish, brown, or black colour. From the texture of this mineral, which is chiefly brought from the neighbourhood of volcanoes, some persons have imagined it to be asbestos decomposed by the action of fire. Its lightness is such that, placed in water, it will float. To mechanics and other artists purnice stone is a very useful mineral. It is employed for cleansing and smoothing the surface of wood, leather, metal, stones, glass, and other substances ; and it is used by parch- ment-makers, curriers, and hat-makers.
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