In addition to these types. Utilitarianism has
been crystallised by modern thought into a distinct
doctrine, which may ally itself with either Naturalism
(Bentham, J. S. Mill, and Spencer) or with Intuitionism
(Sidgwick). The cardinal principle of Utilitarianism
is that the " greatest happiness of the greatest number"
is the supreme end of conduct.
There are other doctrines which have received
names and are worthy of notice, but in the follow-
ing pages we shall concentrate attention on Earlier
Naturalism, Intuitionism (including Moral Purism),
Utilitarianism, Evolutional Naturalism and Rational
Idealism. Most other doctrines are either attempts
to effect a synthesis between two or more of these or
are too loosely expressed to be described as philosophy.
