XXIII. Observations on the fossil bones presented to the Royal Society by his most Serene Highness the Margrave of Anspach, &c

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Abstract
The bones which are the subject of the present paper, are to be considered more in the light of incrustations than extra­neous fossils, since their external surface has only acquired a covering of crystallized earth, and little or no change has taken place in their internal structure. The earths with which bones are most commonly incrusted are the calcareous, argillaceous, and siliceous, but principally the calcareous; and this happens in two ways; one, the bones being immersed in water in which this earth is suspended; the other, water passing through masses of this earth, which it dissolves, and afterwards deposits upon bones which lie under­-neath.

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