The worth of this private wish is moreover open to question in the light of the history of the development of natural science. There was a time when in astronomy, chemistry and biology men claimed that judgment of individual phenomena was possible only because the mind was already in possession of fixed truths, universal principles, pre-ordained axioms. Only by their means could contingent, varying particular events be truly known. There was, it was argued, no way to judge the truth of any particular statement about a particular plant, heavenly body, or case of combustion unless there was a general truth already in hand with which to compare a particular empirical occurrence. The contention was successful, that is for a long time it maintained its hold upon men's minds. But its effect was merely to encourage intellectual laziness, reliance upon authority and blind acceptance of conceptions that had somehow become traditional. The actual advance of science did not begin till men broke away from this method. When men insisted upon judging astronomical phenomena by bringing them directly under established truths, those of geometry, they had no astronomy, but only a private esthetic construction. Astronomy began when men trusted themselves to embarking upon the uncertain sea of events and were willing to be instructed by changes in the concrete. Then antecedent principles were tentatively employed as methods for conducting observations and experiments, and for organizing special facts: as hypotheses. In morals now, as in physical science then, the work of intelligence in reaching such relative certainty, or tested probability, as is open to man is retarded by the false notion of fixed antecedent truths. Prejudice is confirmed. Rules formed accidentally or under the pressure of conditions long past, are protected from criticism and thus perpetuated. Every group and person vested with authority strengthens possessed power by harping upon the sacredness of immutable principle. Moral facts, that is the concrete careers of special courses of action, are not studied. There is no counterpart to clinical medicine. Rigid classifications forced upon facts are relied upon. And all is done, as it used to be done in natural science, in praise of Reason and in fear of the variety and fluctuation of actual happenings.