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Letter 11191

Müller, J. F. T. to Darwin, C. R.

19 Oct 1877

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    Doubts that glands of calyx of cleistogamic Malpighiaceae serve as protection.

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    Some species of Solanum bear long- and short-styled flowers on same plant.

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    Changing colours of some flowers may show insects the proper moment for fertilisation.

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    Doubts that the style of Pontederia cordata changes length.

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    Sexual difference in wings of some butterflies due to development in male of scales that emit odours to excite female.

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