Since the era of the re-birth of learning, each successive century has been generally distinguishable by some marked intellectual development, by some strong movement which has taken deep hold of the minds of men. Thus the Renascimento period was followed by the century of the Reformation, and that again by the inauguration of the era of modern philosophy, while the eighteenth century has been claimed as the Saeculum Rationalisticum, the age of rationalism, in which the claims of reason were pushed to the forefront in the domains of religion and politics. Nothing remained after that but an age of physical science, and surely enough has been given us in the nineteenth century which may with equal accuracy be termed the Saeculum Scientificum.

It cannot be doubted that a sort of mental intoxication has been set up as a result of the extraordinary successes which have rewarded the efforts of scientific investigators. Everything now-a-days is expressed in terms of science and its formulae. Evolution is the keynote to the learning of the age. Thus Mr. Spencer's system of the Synthetic Philosophy is a bold and comprehensive attempt to take up the whole knowable, and express it anew in the language of development. It is emphatically, professedly, the philosophy of evolution, the rigid application of a purely scientific formula to everything capable of philosophical treatment. Now, having discussed the question of ethics and religion, their distinction and their intimate relations; having shown how that religion comes as the crown and glory of the ethical life, the transfiguration of the ethical ideal and the most powerful stimulus towards the realisation in practice of what is conceived as theoretically desirable, it remains for us to complete our treatment of this aspect of the ethical problem and determine the relations existing between morals and science.

This question we conceive to be of vital importance. Just as we must be inexorable in refusing to base our ethic on religion, and still less on theology, so must we be equally determined in repudiating the claim often put forward, that morality is a department of physics, or in any way founded on physical science. The scientific professor, feeling the ground strong under his feet, and sure of the applause of his very numerous public, has made a bold bid for the control of the moral order. He has made a serious attempt to capture the ethical world, and to coerce morality into obedience to the inflexible formulae of physics. The evolutionist, in particular, is consumed with an irresistible desire to stretch the ethical ideal on his procrustean couch and to show how, like everything else, it has been the subject of painfully slow growth and development, and that when the stages of that growth have been accurately ascertained by research into the records of the past, the essence of morality is fully explained. Originally non-extant, it has become at length, after aeons of struggle, the chief concern of man, the "business of all men in common," as Locke puts it, all of which philosophy is tantamount to saying, that morality is merely a flatter of history. When you know its history, you know everything, very much as a photographer might claim to exhaustively know an individual man, because he had photographed him every six months from his cradle to his grave. A very inadequate philosophy of ethic, this.

But, before coming to close quarters with this extremely interesting problem, I would protest that we are sincere in our loyalty and enthusiasm for physical science, sincere in our deep admiration for its chief exponents. We claim to be students of the students of nature, for, after all, nature herself is the great scientist. The secrets are all in her keeping. The All-Mother is venerable indeed in the eyes of every one of us. "The heated pulpiteer" may denounce modern science as the evil genius of our day, the arch-snare of Satan for the seduction of unwary souls and the overthrow of Biblical infallibility, but we are not in that galley. As true sons of our age, we are loyal to its spirit, and that spirit is scientific. The late Professor Tyndall said of Emerson, the veritable prophet and inspiration of ethical religion: "In him we have a poet and a profoundly religious man, who is really and entirely undaunted by the discoveries of science, past, present and prospective, and in his case poetry, with the joy of a bacchanal, takes her graver brother science by the hand, and cheers him with immortal laughter. By Emerson scientific conceptions are continually transmuted into the finer forms and warmer lines of an ideal world." It is in no spirit, therefore, of hostility to physical science or her methods that we venture to point out that the term science is not synonymous with experimental research. The most brilliant work of Darwin, Kelvin or Edison in no wise alters the fact that there are more things in heaven and earth than are revealed by their microscopes or decomposed in their crucibles. Mental science, and above all moral or ethical science, have a claim to be heard as well as physics. Philosophy, strictly speaking, working by the light, not of the senses, as does physical science, but by the higher light of the intelligence alone, must be reckoned with by the thoughtful man. Yet this is precisely what so many of the lesser luminaries of science, the popularisers of the great discoveries made by other and greater men, appear to be wholly unable to see. They have borrowed their foot-rule for the mensuration of the universe, and they apply it indiscriminately. Everything, from the dead earth to the glowing inspiration of the prophet's soul, must be labelled in terms of that infallible instrument. If it cannot be reduced to their exiguous standard, so much the worse for it. Science, or rather "the heated pulpiteer" of science (for these inflammatory gentlemen are found both in the pulpit and at the rostrum), can take no account of it, and that settles the matter once for all.

We may proceed to offer a few illustrations of the attempt of the scientist to capture the domain of ethics. The late Professor Huxley, of whom we would speak with all the respect due to his high position as a scientific expositor, roundly asserts that "the safety of morality is in the keeping of science," meaning, of course, physical science. The same authority considers science a far "better guardian of morality than the pair of old shrews, philosophy and theology," in whose keeping he evidently thinks everybody, not a scientist, believes morality to rest. The teaching of such men as Mr. Spencer, Mr. Bain, and Mr. Leslie Stephen, though they lack the vigour and picturesqueness of Mr. Huxley's unique style, comes to much the same thing. Under the extraordinary delusion that all the world, excepting a few enlightened scientific men, believes morality to be under the tutelage of a "pair of shrews," to wit, philosophy and theology, they at once proceed to fly to the opposite extreme error, and to proclaim that it is under the guardianship of physical science. We have already satisfied ourselves that morality is not based on religion, but contrariwise that religion is built on the sanctified emotions of the human heart, that is on the moral ideal—"a new church founded on moral science"—and as to theology, I should not waste my time in attempting to show that morality is not based on that. But it will be worth our while to show that Mr. Huxley and his brethren are under a serious misapprehension when they suppose that having dispossessed theology of a property which no sane man believes it ever possessed, they are at once entitled to appropriate the same themselves in the name of physical science. We shall see that there is a third claimant in the field of whom the extremists on either side appear to have lost sight, and that when the case is fully set forth a verdict in its favour will be inevitable. Meanwhile, let us look at the scientific claim. Is the criterion of conduct in the custody of the scientific experimenter? If a man wanted to know whether a certain act was good, bad or indifferent, such a course of conduct permissible or not, is he to consult the biologist or the chemist?

I venture to affirm, in language of the most explicitness, that physical science can know absolutely nothing about morality; that ethics are a matter of profound indifference to it, that, as Diderot, the encyclopaedist—certainly not suspect in such matters—says, "To science there can be no question of the unclean or the unchaste". You might as well ask a physician for an opinion about law as to put a case of conscience before an astronomer.

There has been, as a matter of fact, an extraordinary amount of loose thinking concerning the precise relations between science, ethics and religion. The churches, having become irretrievably discredited in their doctrinal teaching (their very ministers, in the persons of Stanley and Jowett, openly avowing disbelief in their articles and creeds), religion has come to be looked upon as a sort of no man's land, and therefore the legitimate property of the first occupier. Science, as the enterprising agency par excellence of the century, has stepped in, and in claiming to exhaustively explain religion, virtually claims to have simultaneously annexed morality, erroneously looked upon as a department of religion.

But a little more careful thinking ought to convince the most eager of the advance-agents of physical science that the discipline they serve so loyally is altogether unconcerned with the moral life, and wholly incompetent to deal with its problems. Mr. Frederic Harrison once asked, and with extreme pertinence, what the mere dissector of frogs could claim to know of the facts of morality and religion? Positively nothing, as such, and in their more sober moments "the beaters of the drum" scientific would appear to be well aware of the fact. For instance, Mr. Huxley himself, oblivious of all he had claimed in the name of physical science, asked with surprise, in what laboratory questions of aesthetics and historical truth could be tested? In what, indeed? we may well ask. And yet the physical science which is avowedly incapable of deciding the comparatively insignificant matters of taste and history is prepared to take over with the lightest of hearts the immense burden of morality and to become the conscience-keeper, I had almost said the Father Confessor, of humanity! I imagine Mr. Huxley himself would have shrunk before the assumption of such responsibility.

But let us approach the matter more closely. To physical science, one act is precisely the same as another; a mere matter of molecular movement or change. You raise your arm, you think with the energy and profundity of a Hegel; to the physicist it is all one and the same thing—a fresh distribution of matter and motion, muscular contraction, and rise and fall of the grey pulp called brain. A burglar shoots a policeman dead and the public headsman decapitates a criminal. To physical science, those two acts differ in no respect. They are exercises of muscular energy, expenditure of nervous power, the effecting of molecular change, and there the matter ends. But surely, you would urge, the scientist would discriminate between those two acts. Most assuredly. The one he would reprobate as immoral, and the other he would approve as lawful. But, be it carefully noted, he would do this, not as a scientist, but as a citizen respecting law and order and upholding good government based on morality and justice. As a moralist, then, but not as a scientist does he pass judgment, for there is no experimental science which deals with such matters. Physics concerns itself solely with what it can see and handle—nothing else. The actions, therefore, of right and wrong, justice and injustice, morality and immorality are simply unintelligible to it, just as unintelligible as they are to the most highly developed animal. It is the fully developed mind or intelligence alone which apprehends the sublime conception of duty, and the indefeasible claims which it has upon the allegiance of the will, and, in consequence, the scientist who denounces injustice and iniquity is no longer on the tripod of the professor, but in the rostrum of the ethical teacher. If I may say so, it supplies us with an admirable illustration of a quick-change performance. The same man performs a double part, and so adroitly is the change managed, that the performer himself is deceived into thinking that he is still the scientist, whereas he has become for the moment the moral professor. But he did not acquire that new teaching in the laboratory; he learnt it in the study.

But there is distinctly one point of close contact between science and morality, which we must not omit to point out. Physical science, particularly physiology, from its intimate acquaintance with the human organism, is admirably adapted for the function of a danger-signal, so to speak, to warn the ignorant and indifferent that a life undisciplined and ill-regulated cannot but end in irretrievable disaster. It thus most powerfully subserves the ends of private and individual morality, just as historical science, which, as Professor Huxley accurately noted, can in no wise be tested in a retort or a crucible, can point the moral when the lawless actions of public bodies or nations threaten the foundations upon which society rests. The physiologist can preach a sermon of appalling severity to the drunkard; he can describe internal and external horrors (as certain to ensue in the victim's case, as night follows day), compared with which the imaginings of a Dante are comparatively tame. He can likewise depict a deplorable future of disease and decay as reserved for the vicious. He can point to a veritable Gehenna strewn with the corpses of unnumbered victims. He can prove to demonstration, if we listen to him, that no organisation such as ours can resist the awful strain put upon it by the poison of alcohol, and the enervating results of an undisciplined existence. "Reform," he can tell us, "or go to perdition;" and most valuable his sermon will be.