Any particular art consists of its rules, _together with_ the theorems on which they depend; and Art in general consists of the truths of Science; only these must be arranged in the order most convenient, not, as in Science (which is an enquiry into the course of nature), for thought, but for practice. Intermediate scientific truths must be framed to serve as first principles of the various arts: and through them the end or purpose of an art will be connected with the means for realising the conditions of its attainment. The end itself, however, is defined by the art, not by the science. Each art has one first principle or major premiss which does not, as the propositions of Science, assert that a thing _is_ or _will be_, but recommends it as what _ought to be_. A scientific theory, however complete, of the history and tendencies of society does not show us (without Teleology, i.e. the Doctrine of Ends) what are the preferable ends. Art itself has its Philosophia Prima, for ascertaining the standard of ends. There can be but one such standard or general principle to which all rules of practice should conform; for, if there were several, a higher yet would be needed, as umpire when they disagreed. In Morality the felt need of a standard has been sometimes supplied by the hypothesis of intuitive moral principles: but a standard would still be wanted for the other two branches of the Art of Life, viz. Prudence or Policy, and Taste; and _their_ standard when found would serve for Morality as well. The true standard, or general principle, is, _the promotion of the happiness of_ ALL _sentient beings_. This is not the _sole_ end; for instance, ideal nobleness of will or conduct should be pursued in preference to the _specific_ pursuit of happiness; but all ends whatsoever must be justified and should be controlled by it. LONDON PRINTED BY SPOTTISWOODE AND CO. NEW-STREET SQUARE