609 Delight in beauty is one of the pleasures of the imagination; there is no limit to its indulgence, and no end to the results which we may ascribe to its exercise. But as for the particular 〜standard of beauty〝 which the bird (for instance) admires and selects (as Darwin says in the Origin, p. 70, edit. 1884), we are very much in the dark, and we run the risk of arguing in a circle: for wellnigh all we can safely say is what Addison says (in the 412th Spectator)〔that each different species 〜is most affected with the beauties of its own kind《....《Hinc merula in nigro se oblectat nigra marito;《...《hinc noctua tetram Canitiem alarum et glaucos miratur ocellos.〝

610 Cf. Bridge, T. W., Cambridge Natural History (Fishes), VII, p. 173, 1904; also Frisch, K. v., Ueber farbige Anpassung bei Fische, Zool. Jahrb. (Abt. Allg. Zool.), XXXII, pp. 171〓230, 1914.

611 Nature, L, p. 572; LI, pp. 33, 57, 533, 1894〓95.

612 They are 〜wonderfully fitted for 〘vanishment〙 against the flushed, rich-coloured skies of early morning and evening《....《their chief feeding-times〝; and 〜look like a real sunset or dawn, repeated on the opposite side of the heavens,〔either east or west as the case may be〝: Thayer, Concealing-coloration in the Animal Kingdom, New York, 1909, pp. 154〓155. This hypothesis, like the rest, is not free from difficulty. Twilight is apt to be short in the homes of the flamingo: and moreover, Mr Abel Chapman, who watched them on the Guadalquivir, tells us that they feed by day.

613 Principal Galloway, Philosophy of Religion, p. 344, 1914.