Origin of Species Variorum

of the creation of each separate species, will have to admit that a sufficient number of the best adapted plants and animals were not .. created for oceanic islands; for man has unintentionally stocked them ... far more fully and perfectly than did nature.

Although in oceanic islands the species are few in number, the proportion of endemic kinds ( I. e. those found nowhere else in the world) is often extremely large. If we compare, for instance, the number of .. endemic land-shells in Madeira, or of .. endemic birds in the Galapagos Archipelago, with the number found on any continent, and then compare the area of the island with that of the continent, we shall see that this is true. This fact might have been theoretically expected, for, as already explained, species occasionally arriving after long intervals of time in a new and isolated district, and having to compete with new associates, would be eminently liable to modification, and would often produce groups of modified descendants. But it by no means follows that, because in an island nearly all the species of one class are peculiar, those of another class, or of another section of the same class, are peculiar; and this difference seems to depend partly on the species which are not .. modified having immigrated ... in a body, so that their mutual relations have not been much disturbed; and partly on the frequent arrival of unmodified immigrants from the mother-country, with which the insular forms have intercrossed. It should be borne in mind that the offspring of such crosses would almost certainly gain in vigour; so that even an occasional cross would produce more effect than might .. have been anticipated. I will give a few illustrations of the foregoing remarks: in the Galapagos Islands there are 26 land-birds; of these 21 (or perhaps 23) are peculiar, whereas of the 11 marine birds only 2 are peculiar; and it is obvious that marine birds could arrive at these islands much more easily and frequently