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" From the fpecimens of foffil elephants tufks, which I have feen in the Emperor of Germany's Cabinet of Natural Curiofities at Vienna, and in other Mufeums, I obferved that feveral were rendered throughout calcarious*, while others were entirely changed... "
A Dissertation on the Antiquity of the Earth: Read at the Royal Society ... - Pagina 11
door James Douglas - 1785 - 86 pagina’s
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The Critical Review: Or, Annals of Literature, Volume 61

Tobias Smollett - 1786 - 506 pagina’s
...explained his opinion pf the conftituent parts of agate, except that it is produced alfo by an acid. 'From the fpecimens of foffil elephants tufks, which...animal matter from the tufk, and to have rendered it furHciently calcarious for the homogeneous fubitance with which it was faturated ; for it is a known...
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