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From:
William Thierry (William) Preyer
To:
Charles Robert Darwin
Date:
[before 17 Feb 1870]
Source of text:
DAR 261.11: 21 (EH 88206073)
Summary:

Notes the differences in haemoglobin between species; this proves, to WP, that natural selection does not act only on morphological development.

Remarks on the differences and similarities in the effects of prussic acid on different groups of animals.

Questions CD on his early education and influences.

Contributor:
Darwin Correspondence Project
From:
William Erasmus Darwin
To:
Charles Robert Darwin
Date:
[c. 17 Feb 1870]
Source of text:
Cornford Family Papers (DAR 275: 36)
Summary:

Ask whether CD would like to subscribe again to National Education League. Describes the League’s goals.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Gustav Jäger
Date:
17 Feb 1870
Source of text:
Frau Dr Hildegard Jaeger (private collection)
Summary:

Encloses his letter to GJ [6885], which was returned.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
William Thierry (William) Preyer
Date:
17 Feb [1870]
Source of text:
Ralph Colp Jr (private collection)
Summary:

Comments on effects of prussic acid on different individuals of the same species and other physiological research by WP.

Provides information about his studies in Edinburgh and Cambridge and qualifications he had for Beagle voyage. Describes influence of R. E. Grant and J. S. Henslow.

Contributor:
Darwin Correspondence Project