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To Charles Lyell   9 October [1866]

Summary

Comments on proofs [of Principles of geology, 10th ed. (1867–8)]: CL does not allude to the specialisation of classes.

Discusses CL’s argument from the absence of Cetacea in Secondary rocks;

finds his discussion of man "superfluous and too orthodox".

Author:  Charles Robert Darwin
Addressee:  Charles Lyell, 1st baronet
Date:  9 Oct [1866]
Classmark:  American Philosophical Society (Mss.B.D25.320)
Letter no:  DCP-LETT-5236

To Charles Lyell   12 October [1866]

Summary

More comments on proofs [of CL’s Principles of geology, 10th ed.]. Discusses permanence of continents and other points.

Refers to passage describing evaporation of snow in Journal [of researches, pp. 277–8].

Cites astronomers’ views on increasing length of day.

Author:  Charles Robert Darwin
Addressee:  Charles Lyell, 1st baronet
Date:  12 Oct [1866]
Classmark:  American Philosophical Society (Mss.B.D25.321)
Letter no:  DCP-LETT-5239
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