 The three methods of ethics—egoism, intuitional morality, and utilitarianism—respectively form the subject matter of books two through four of the Methods, which brackets them with an opening book reviewing the whole work and a concluding chapter on “The Mutual Relations of the Three Methods.” Each of these books represents in itself a classic treatment of the view at issue, though it is the chapter on utilitarianism that has perhaps most often been treated as such. This architectonic can, however, make it somewhat difficult to follow the thread of Sidgwick’s thought, particularly on the more philosophical points having to do with intuitionism. Indeed, intuitionism figures in both the second method of ethics, and, in a more philosophical form, in the treatment of all the methods of ethics, particularly when it comes to the discussion of fundamental principles. As Sidgwick explains, although some might think that conscience delivers immediate judgments on particular acts—a view he variously calls aesthetic, perceptional or ultra intuitionism—“reflective persons, in proportion to their reflectiveness, come to rely rather on abstract universal intuitions relating to classes of cases conceived under general notions.” Hence, dogmatic intuitional morality, which in the Methods is rather awkwardly taken to cover both more deontological views and non-hedonistic teleological ones, on the ground that the latter tend to construe virtue in the same fashion as the simply the done thing, whatever the consequences. But the process of reflection should not stop there: there is another, more sophisticated phase of intuitionism. Without “being disposed to deny that conduct commonly judged to be right is so, we may yet require some deeper explanation why it is so.” Thus, philosophical intuitionism, “while accepting the morality of common sense as in the main sound, still attempts to find for it a philosophic basis which it does not itself offer: to get one or more principles more absolutely and undeniably true and evident, from which the current rules might be deduced, either just as they are commonly received or with slight modifications and rectifications.” (Sidgwick 1874 [1907: 102]),