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CHAP. 15.—EGYPTIAN EARTH.

Of the other kinds of rubrica, those of Egypt and Africa are of the greatest utility to workers in wood, from the fact of their being absorbed with the greatest rapidity. They are used also for painting, and are found in a native state in iron-mines.1

1 Ajasson thinks that this was an hydroxide of iron, of a greenish yellow or brown colour.

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