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1860-1869::1866::10 in date 
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From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
9 Oct [1866]
Source of text:
American Philosophical Society (Mss.B.D25.320)
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".

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
12 Oct [1866]
Source of text:
American Philosophical Society (Mss.B.D25.321)
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.

Contributor:
Darwin Correspondence Project