Letter 13750A
Müller, J. F. T. to Darwin, C. R.
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Apologises for not having answered CD's letters of 19 December [13564] and 4 January [13599] sooner.
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Gives the results of his crossing experiments with Pontederia (Eichhornia) crassipes and P. azurea. Has also begun experiments on Heteranthera reniformis.
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Thanks CD for sending three parts of the first volume of Bentham and Hooker's Genera plantarum.