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It is to be noticed that the authors who have discussed heterostylism are not satisfied with the usual explanation, which is that the insects which visit the flowers carry the pollen at different relative positions on their bodies corresponding to the different lengths of the sexual organs and so produce the wonderful result. Darwin, moreover, admits that bees carry all sorts of pollen on every part of their bodies; so that it has still to be made clear how the female organs dusted with two or three kinds of pollen make their choice of the most suitable. The supposition of a power of choice, however interesting and wonderful it is, does not account for the bad results which follow artificial dusting with the wrong kind of pollen (so-called “illegitimate fertilisation”). The theory that the stigmas can only make use of, or are capable of receiving only “legitimate pollen” has been proved by Darwin to be erroneous, inasmuch as the insects which act as fertilisers certainly sometimes start various cross-breedings.