373
SOLD BY ORDER OF THE EXECUTORS OF THE LATE CHARLES, 3RD BARON LYELL
Darwin, Charles
TWO AUTOGRAPH LETTERS SIGNED, TO LEONARD HORNER
discussing Horner's paper on the geology of the Nile basin, the first letter suggesting a few cuts and politely querying his reference to "baked sandstone" ("...I have seen great areas coated with from 1 or 2 to (I think) 10 or 12 feet of dark brown, & black & angularly vesicular rock, having a most curious vitrified appearance, but which certainly was owing to a curious modification of the oxides of iron contained in it. Certainly there had been no heat from below, & certainly the whole deposit is simply superficial, & alluvial..."), the second letter further elaborating his account of ferruginous beds and their striking appearance ("...Another [naval officer] on coast of Australia said that the whole country seemed to have been fused by a flash of Lightning..."), 12 pages, 8vo, Down, Farnborough, Kent, 18 March and 27 April 1855
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12,000
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