Read this Herman Melville excerpt from "Introduction to Dark Romanticism: American Gothic."Hither, and thither, on high, glided the snow-white wings of small, unspeckled birds; these were the gentle thoughts of the feminine air; but to and fro in the deeps, far down in the bottomless blue, rushed mighty leviathans, sword-fish, and sharks; and these were the strong, troubled, murderous thinkings of the masculine sea.What Dark Romantic theme is reflected in the excerpt?