(1) A multitude of details may be illustrative of a comparatively small number of general principles. It is with these general principles that the moralist is concerned. The anthropologist may regard it as his duty to spend much labor in the attempt to discover why this or that act, this or that article of food, happens in a given community to be taboo to certain persons. The student of ethics is not bound to take up the detailed investigation of such matters. Human nature, in its general constitution, is much the same in different races and peoples. The influence of environment is everywhere apparent. There are significant uniformities to be discovered even by one who has a limited amount of detailed information. "Those who come after us will see nothing new," said Antoninus, "nor have those before us seen anything more, but in a manner he who is forty years old; if he has any understanding at all, has seen by virtue of the uniformity which prevails all things which have been and all that will be." [Footnote: _Thoughts_, XI, 1. London, 1891, translated by GEORGE LONG.] Which is, to be sure, an overstatement of the case, but one containing a germ of truth. (2) We find, by looking into their books, that men most intimately acquainted with the facts of the moral life as revealed in different races and peoples may differ widely in the ethical doctrine which they are inclined to base upon them. Not all men, even when endowed with no little learning, are gifted with the clearness of vision which can detect the significance of given facts; nor are all equally capable of weaving relevant facts into a consistent and reasonable theory. The keenness and the constructive genius of the individual count for much. And breadth of view counts for much also. We have seen that ethics touches many fields of investigation, and the philosopher is supposed, at least, to let his vision range over a broad realm, and to grasp the relations of the different sciences to each other. He is, moreover, supposed to be trained in reflective analysis, and of this ethical theory appears to stand in no little need. (3) Finally, the mere fact that ethics has for so many centuries been regarded as one of the disciplines falling within the domain of the philosopher is not without its significance. One may deplore the tendency to base ethics upon this or that metaphysical doctrine, and desire to see it made an independent science; and yet one may be compelled to admit that it is not easy to comprehend and to estimate the value of many of the ethical theories which have been evolved in the past, without having rather an intimate acquaintance with the history of philosophy. The ethical teachings of Plato, of Aristotle, of St. Thomas, of Kant, of Hegel, of Green, lose much of their meaning when taken out of their setting. The history of ethical theory is blind when divorced from the history of philosophy, and with the history of ethical theory the moralist should be acquainted.