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From:
Charles Robert Darwin
To:
William Branwhite Clarke
Date:
25 Oct [1861]
Source of text:
Mitchell Library, Sydney (MLMSS 139/36X, pp. 263–72)
Summary:

Thanks WBC for his account of glacial action in Australia. A mundane cooler period would throw a flood of light on geographical distribution. Has sketched a large MS on subject but does not know whether he will live to publish it.

Questions WBC on striated granite boulders.

Asks him to make a botanical experiment on insect fertilisation.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
John Lindley
Date:
25 Oct [1861]
Source of text:
Royal Botanic Gardens, Kew (Lindley letters, A–K: 194)
Summary:

Sends thanks for an informative letter;

would be grateful for any orchids; names some he would particularly like.

Contributor:
Darwin Correspondence Project
From:
Sir John Herschel
To:
Robert Main
Date:
[25 October 1861]
Source of text:
RS:HS 23.344
Summary:

Suggests an observational program for RM's newly purchased transit circle [see RM's 1861-10-21].

Contributor:
John Herschel Project