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56 consequently not nearly so handsome, in the larger fledged young ones. That here the intensity of the hue was gained gradually through sexual selection, I—being a believer in sexual selection—can have no doubt, and the lesser degree of it in the young bird would be due to a well-known principle of inheritance, which has been pointed out or, rather, discovered by Darwin. If, therefore, the inner colouring has been acquired in the same manner, it ought also to be first light and become brighter by degrees. I must now watch for these young cormorants to open their bills, for it is a habit which they share, more or less, with their parents, and out of it, as I believe, the adornment has grown.

I have no doubt that numbers of shags roost in these caverns during the night, for when I was lost on Raasey Isle in Skye, I came to a huge vaulted chamber in the cliffs, into which scores—perhaps hundreds—both of these birds and the common cormorant flew, after the sun had set. When they were all settled, every ledge, crevice, and pinnacle seemed tenanted by them, and never shall I forget the gloom, the grandeur, and the loneliness of this scene. I admired it, though naked, except for a torn pair of trousers which were half wet through. I should like to see them come flying into their caves here also, where I am not so forlorn; but the distance of my hut from this part of the shore, the lateness of the hour up to which the light lasts, and my having to