The Letter Of Per Egrinus

terial ; one having reddish spots and small holes in it should not be chosen; yet a lodestone is hardly ever found entirely free from such blemishes. On account of uniformity in its composition and the compactness of its innermost parts, such a stone is heavy and therefore more valuable. Its strength is known by its vigorous attraction for a large mass of iron ; further on I will explain the nature of this attraction. If you chance to see a stone with all these characteristics, secure it if you can.

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