Mercury, or quicksilver as it is sometimes called in the vulgar tongue, is a heavy metal with an unusually low melting point. On that account, it is in liquid form at ordinary temperatures; and its use is possible in thermometers for measuring most terrestrial temperatures. It is produced in five or six times the quantity of a metal like gold; but, because its uses, though unique, are limited, it usually sells for about $1 a lb., while gold is worth 300 times that amount.
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