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From W. D. Fox   9 December [1868]

Summary

Hybrid geese.

Proportions of sexes in sheep and cattle.

Pairing habits of crows.

Author:  William Darwin Fox
Addressee:  Charles Robert Darwin
Date:  9 Dec [1868]
Classmark:  DAR 84.1: 126–7, DAR 85: B36–7
Letter no:  DCP-LETT-6455

To G. H. Darwin   [9 December 1868]

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Summary

Asks GHD to look in William Thomson’s book [W. Thomson and P. G. Tait, Treatise on natural philosophy, vol. 1 (1867)] to see how many million years ago Thomson says earth’s crust solidified. CD is troubled by "brevity of the world", because pre-Silurian creatures must have lived during endless ages "else my views wd be wrong, which is impossible – Q.E.D.".

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  [9 Dec 1868]
Classmark:  DAR 210.1: 6
Letter no:  DCP-LETT-6496