Text Online
From:
Maine, H. S.
To:
Darwin, G. H.
Date:
19 October [1877 or 1878]
Source of text:
DAR 251: 1906
Summary:
No summary available.
Contributor:
Darwin Family Letters
No summary available.
Interesting article by Fritz Müller on sexual selection in butterflies, Kosmos [1 (1877): 388–95].
JDH has just returned from U. S., where he worked on N. American geographical distribution with Asa Gray.
Doubts that glands of calyx of cleistogamic Malpighiaceae serve as protection.
Some species of Solanum bear long- and short-styled flowers on same plant.
Changing colours of some flowers may show insects the proper moment for fertilisation.
Doubts that the style of Pontederia cordata changes length.
Sexual difference in wings of some butterflies due to development in male of scales that emit odours to excite female.