It would be impossible, in a brief paper, to cover the ground of the nomenclature, of the literature, of scientific knowledge and speculation concerning the Pleiades. A long chapter in a book might be given to Alcyone alone--that bright particular star of which it has been calculated that, in comparison, our Sun would sink to a star below the tenth magnitude. Indeed, though the imagination strains after the astronomer’s calm march with dazzled vision, our solar brilliancy is supposed to be surpassed by some sixty to seventy of the Pleiadic group, for all that our human eyes have from time immemorial seen therein only a small cluster of tiny stars, the ‘seven’ of Biblical and poetic and legendary lore, from ‘the Seven Archangels’ to the popular ‘Hen and her six chicks.’ Alcyone, that terrible torch of the ultimate heavens, is eighty-three times more refulgent than that magnificent star Sirius, which has been called the ‘Glory of the South’: a thousand times larger than our Sun. I do not know how Merope and Taygeta, Celeno and Atlas are, but Maia, that shaking loveliness of purest light, has been calculated to be four hundred times larger than the Sun, and Electra about four hundred and eighty times larger. When one thinks of this mysterious majesty, so vast that only the winged imagination can discern the illimitable idea, all words fail: at most one can but recall the solemn adjuration of the shepherd-prophet Amos, ‘_Seek Him that maketh Pleiades and Orion_,’ or the rapt ecstasy of Isaiah, ‘_O day star, son of the morning_.’