Scientific biology has made tremendous progress lately; engineers cannot afford to ignore the facts established in laboratory researches. The problem of “life” and of other energies, hitherto considered “_super_natural,” is well in hand, and proves to be none the less astonishing though entirely natural. A number of scientists all over the world are working at this problem and the scientific facts which they have established, and which cannot now be denied, belong to-day to the realm of practical life. Engineers, of course, have to know these facts; mathematicians have to establish correct dimensions in the study of all the sciences and people will have to study mathematical philosophy; only then can the process of integration in any phase of thought be made without mistakes. There is no escape from that, if _truth_ is what we really want. But here one objection may be raised, an objection which for some is a serious one indeed; namely, what will take the place of the old philosophy, law and ethics, if human life is nothing else than a physico-chemical process? To quote Doctor Jacques Loeb from his _Mechanistic Conception of Life_: “If on the basis of a serious survey, this question (_that all life phenomena can be unequivocally explained in physico-chemical terms_—Author) can be answered in the affirmative, our social and ethical life will have to be put on a scientific basis and our rules of conduct must be brought into harmony with the results of scientific biology. Not only is the mechanistic conception of life compatible with ethics, it seems the only conception of life which can lead to an understanding of the source of ethics.” I hope to have proved in this book that _scientific_ ethics is based on natural laws for the human class of life; that it is based on the experimentally proved fact that Man is a Time-binder, naturally active as such in time; and that this concept or definition of Man is rigorously scientific and accounts for the highest functions of man—the highest of the mental and spiritual perfections—without the need of any “_super_natural” hypothesis.