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The Pamphlet Collection of Sir Robert Stout: Volume 2

No. 327

No. 327.

This sample was forwarded by Captain Hutton. It is hydrated sesquioxide of iron, of fair quality. It yielded:—
Water 7 per cent.
Sesquioxide 55 per cent.
Earthy matter, chiefly silica 38 per cent.

The silica (about 20 per cent.) would require lime for its removal. Equal to 38.5 per cent, per metal.