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DCP-LETT-7634

From:
Frans Cornelis (Franciscus Cornelius) Donders
To:
Charles Robert Darwin
Date:
28 Mar 1871
Source of text:
DAR 162: 228
Summary:

Answers to CD’s queries will take time. CD may not be aware of the influence of accommodation on the diameter of the pupil of the eye. Parrots, for example, contract or dilate the pupil independently of amount of light [see Expression, p. 304]. Sends his book on the subject [On the anomalies of accommodation and refraction of the eye (1864)].

Contributor:
Darwin Correspondence Project

DCP-LETT-7633

From:
Harrison William Weir
To:
Charles Robert Darwin
Date:
28 Mar 1871
Source of text:
DAR 181: 72
Summary:

Effects of first impregnation on litters from subsequent pregnancies.

Power of selective breeding to produce different varieties.

Contributor:
Darwin Correspondence Project

DCP-LETT-7637

From:
William Turner
To:
Charles Robert Darwin
Date:
[after 28 Mar 1871]
Source of text:
DAR 88: 82
Summary:

Note on errata in first volume of Descent.

Contributor:
Darwin Correspondence Project
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