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. 1852. Excerpt: ... T. Silica.--In flint and rock ' crystals, we have examples of this earth. It is harder than glass; and, in the. common form in which it is'"'-found, is insoluble. It appears, in this form, to be one of the most indifferent of all bodies. Yet...
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