The term Ethics, which we thus use to designate this branch of study, with its systematized truth, is not employed with etymological strictness. For it comes from the Greek ἦθος [Greek: êthos], moral character, which, according to Aristotle is derived from ἔθος [Greek: ethos] custom, under the notion that moral virtue is a product of repeated acts of voluntary preference.[1] Taken strictly this would build rectitude or the ethically right on the mere habits or usages of a people. But this conception of the basis of virtue must not be included and carried into the scientific use of the word, or be at all allowed to prejudice the final decision of this great question of the foundation of right, in the end, in the light of all the facts in the case.[2] The Latin equivalent for ἦθος [Greek: êthos] was _mos_, with similar suggestion as to the nature of rectitude, and human duty was treated under the head of De Moribus. Cicero says: "_Quia pertinet ad mores, quod ἦθος [Greek: êthos] illi vocant, nos eam partem philosophiæ De Moribus appellare solemus; sed decet augentem linguam Latinam nominare Moralem._"[3] This suggestion of Cicero has given the common English designation Morals or Moral Philosophy. Recent usage, however, speaks of the study rather as moral science, in harmony with the prevailing preference for the term science in all investigations conducted under the inductive method. It is, nevertheless, as will appear, largely a metaphysical and philosophical investigation, and, if classed as science, must be counted as pre-eminently a philosophical science. ==Historical Glance.==