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CHAP. 54.—THE VARIOUS KINDS OF ERETRIA.

Of eretria, or Eretrian1 earth, there are also the same number of varieties; one white, and the other of an ashy colour, this last being preferred in medicine. To be good, this earth should be of a soft consistency, and when rubbed upon copper it should leave a violet tint. The virtues of cretria in a medicinal point of view, and the methods of using it, have been already mentioned2 in our description of the pigments.

1 In Chapter 21 of this Book.

2 In Chapter 21 of this Book.

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