Only horoscopes are not always accurate, and the necessity, when judging a work of art, of including the temporal factor in the sum total of its beauty introduces, to our way of thinking, something as hazardous, and consequently as barren of interest, as every prophecy the non-fulfilment of which will not at all imply any inadequacy on the prophet's part, for the power to summon possibilities into existence or to exclude them from it is not necessarily within the competence of genius; one may have had genius and yet not have believed in the future of railways or of flight, or, although a brilliant psychologist, in the infidelity of a mistress or of a friend whose treachery persons far less gifted would have foreseen.