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248, the buccal cavity is displayed by the one sex as a charm or attraction before the eyes of the other, having been specially coloured in order to render it so. A question, however, is raised by this conclusion in regard to which I have, as yet, said nothing, but which I will shortly discuss in a separate chapter, since I have been unable to compress it into any of the foregoing ones. It had occurred to me as a result of my general field observations, before these particular ones which have only served to emphasise it.