Hitherto, the doctrine of Utility has been assumed, in order to be fully stated. We must next review the evidence in its favour, and the objections urged against it. It is desirable, however, to ask what kind of proof should be expected on such a question. In the Speculative or Theoretical sciences, we prove a doctrine by referring it to some other doctrine or doctrines, until we come at last to some assumption that must be rested in as ultimate or final. We can prove the propositions of Euclid, the law of gravitation, the law of atomic proportions, the law of association; we cannot prove our present sensations, nor can we demonstrate that what has been, will be. The ultimate data must be accepted as self-evident; they have no higher authority than that mankind generally are disposed to accept them. In the practical Sciences, the question is not as to a principle of the order of nature, but as to an _end_ of human action. There may be _derived_ Ends, which are susceptible of demonstrative proof; but there must also be _ultimate_ Ends, for which no proof can be offered; they must be received as self-evident, and their sole authority is the person receiving them. In most of the practical sciences, the ends are derived; the end of Medicine is Health, which is an end subsidiary to the final end of human happiness. So it is with Navigation, with Politics, with Education, and others. In all of them, we recognize the bearing upon human welfare, or happiness, as a common, comprehensive, and crowning end. On the theory of Utility, Morals is also governed by this highest end. Now, there can be no proof offered for the position that Happiness is the proper end of all human pursuit, the criterion of all right conduct. It is an ultimate or final assumption, to be tested by reference to the individual judgment of mankind. If the assumption, that misery, and not happiness, is the proper end of life, found supporters, no one could reply, for want of a basis of argument--an assumption still more fundamental agreed upon by both sides. It would probably be the case, that the supporters of misery, as an end, would be at some point inconsistent with themselves; which would lay them open to refutation. But to any one consistently maintaining the position, there is no possible reply, because there is no medium of proof. If then, it appears, on making the appeal to mankind, that happiness is admitted to be the highest end of all action, the theory of Utility is proved. 9. The judgment of Mankind is very generally in favour of Happiness, as the Supreme end of human conduct, Morality included. This decision, however, is not given without qualifications and reservations; nor is there perfect unanimity regarding it.