Text Online
From:
Darwin, Leonard
To:
Darwin, G. H.
Date:
[21 or 28 September 1877]
Source of text:
DAR 219.6: 10
Summary:
No summary available.
Contributor:
Darwin Family Letters
No summary available.
Encloses Fritz Müller’s letter.
Is exhibiting butterflies in which variations in the female show a finely graded series. Believes dimorphism can be explained by the selection of the extremes of such a series and the consequent extinction of the intermediates.