attempts are made to render by this means even more remarkable instances. (Figs. 113, 114, 115.) [Illustration: FIG. 113.--Three cases of mimicry. Drawn from nature: first two pairs nat. size, last pair 2/3 (_R. Coll. Surg. Mus._).] [Illustration: FIG. 114.--Two further cases of mimicry; flies resembling a wasp in the one and a bee in the other. Drawn from nature: nat. size (_R. Coll. Surg. Mus._).] [Illustration: FIG. 115.--A case of mimicry where a non-venomous species of snake resembles a venomous one. Drawn from nature: 1/3 nat. size (_R. Coll. Surg. Mus._).] It is surely apparent, without further comment, that it is impossible to imagine stronger evidence in favour of natural selection as a true cause in nature, than is furnished by this culminating fact in the matter of protective resemblance, whereby it is shown that a species of one genus, family, or even order, will accurately mimic the appearance of a species belonging to another genus, family, or order, so as to deceive its natural enemies into mistaking it for a creature of so totally different a kind. And it must be added that while this fact of mimicry is of extraordinarily frequent occurrence, there can be no possibility of our mistaking its purpose. For the fact is never observable except in the case of species which occupy the same area or district. Such being what appears to me the only reasonable view of the matter, I will now conclude this chapter on the evidences of natural selection as at all events the main factor of organic evolution, by simply adding illustrations of two further cases of mimicry, which are perhaps even more remarkable than any of the foregoing examples. The first of the two (Fig. 115) speaks for itself. The second will be rendered intelligible by the following few words of explanation.