If he hopes finally to solve his great problem, it is by careful experiments in pigeon-fancying, and other sorts of artificial variety-making. His hero is not a self-enclosed, excited philosopher, but “that most skilful breeder, Sir John Sebright, who used to say, with respect to pigeons, that he would produce any given feathers in three years, but it would take him six years to obtain a head and a beak.” I am not saying that the new thought is better than the old; it is no business of mine to say anything about that; I only wish to bring home to the mind, as nothing but instances can bring it home, how matter-of-fact, how petty, as it would at first sight look, even our most ambitious science has become.