Scientific Men as Public Teachers.

Science is in all but undisputed possession of the physical world, and it is making claims which grow stronger every day to jurisdiction over the moral and mental world, which it insinuates, if it does not allege, are but provinces of the physical world. It ought not to be forgotten that one of the greatest scientific men who ever lived--Kepler--preceded his great discoveries by a series of fanciful hypotheses, of which his biographers are ashamed; that he believed in astrology, and even cast nativities. It is not at all unreasonable to ask men of science, therefore, to lay down the rule for themselves, not to communicate ex cathedra to popular audiences any hypothesis as scientific which, while it is capable of producing great moral confusion, is not capable of verification.