Apologises for not having answered CD’s letters of 19 December [13564] and 4 January [13599] sooner.
Gives the results of his crossing experiments with Pontederia (Eichhornia) crassipes and P. azurea. Has also begun experiments on Heteranthera reniformis.
Thanks CD for sending three parts of the first volume of Bentham and Hooker’s Genera plantarum.