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From Charles Lyell   [16 January 1857]

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Summary

Enumerates fossil mammals known in Secondary strata.

Lack of angiosperm plants in rocks older than Chalk is no reason to anticipate rarity of warm-blooded quadrupeds.

Author:  Charles Lyell, 1st baronet
Addressee:  Charles Robert Darwin
Date:  [16 Jan 1857]
Classmark:  DAR 205.9: 394
Letter no:  DCP-LETT-2039

To Charles Lyell   11 February [1857]

Summary

Discusses a proposed expedition to Australia. Urges collecting and investigating productions of isolated islands. Recommends dredging the sea-bottom.

Mentions keeping Helix pomatia alive in sea-water.

Author:  Charles Robert Darwin
Addressee:  Charles Lyell, 1st baronet
Date:  11 Feb [1857]
Classmark:  American Philosophical Society (Mss.B.D25.145)
Letter no:  DCP-LETT-2050

To Charles Lyell   13 April [1857]

Summary

CD returns a letter from Wollaston.

Although opposed to the Forbesian doctrine [of continental extension] as a general rule, CD would have no objection to its being proved in some cases. Does not think Wollaston has proved it; nor can anyone until more is known about the means of distribution of insects – but the identity of the two faunas is certainly interesting.

His health is very poor and his "everlasting species-Book" quite overwhelms him with work. It is beyond his powers, but he hopes to live to finish it.

Author:  Charles Robert Darwin
Addressee:  Charles Lyell, 1st baronet
Date:  13 Apr [1857]
Classmark:  The University of Edinburgh Centre for Research Collections (Gen.109/702)
Letter no:  DCP-LETT-2077
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letter (3)
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