No one need be told how indispensable it is to have true ideas—just concepts—correct notions—of the things with which we humans have to deal; everyone knows for example, that to mistake solids for surfaces or lines would wreck the science and art of geometry; anyone knows that to confuse fractions with whole numbers would wreck the science and art of arithmetic; everyone knows that to mistake vice for virtue would destroy the foundation of ethics; everyone knows that to mistake a desert mirage for a lake of fresh water does but lure the fainting traveler to dire disappointment or death. Now, it is perfectly clear that of all the things with which human beings have to deal, the most important by far is Man himself—humankind—men, women and children. It follows that for us human beings nothing else can be quite so important as a clear, true, just, scientific concept of Man—a right understanding of what we as human beings really are. For it requires no great wisdom, it needs only a little reflection, to see that, if we humans radically misconceive the nature of man—if we regard man as being something which he is not, whether it be something higher than man or lower—we thereby commit an error so fundamental and far reaching as to produce every manner of confusion and disaster in individual life, in community life and in the life of the race. The question we have, therefore, to consider first of all is fundamentally: What is Man? What is a man? What is a human being? What is the defining or characteristic mark of humanity? To this question two answers and only two have been given in the course of the ages, and they are both of them current to-day. One of the answers is biological—man is an animal, a certain kind of animal; the other answer is a mixture partly biological and partly mythological or partly biological and partly philosophical—man is a combination or _union_ of animal with something supernatural. An important part of my task will be to show that both of these answers are radically wrong and that, beyond all things else, they are primarily responsible for what is dismal in the life and history of humankind. This done, the question remains: What is Man? I hope to show clearly and convincingly that the answer is to be found in the patent fact that human beings possess in varying degrees a certain natural faculty or power or capacity which serves at once to give them their appropriate dignity as human beings and to discriminate them, not only from the minerals and the plants but also from the world of animals, this peculiar or characteristic human faculty or power or capacity I shall call the _time-binding_ faculty or _time-binding_ power or _time-binding_ capacity. What I mean by time-binding will be clearly and fully explained in the course of the discussion, and when it has been made clear, the question—What Is Man?—will be answered by saying that man is a being naturally endowed with time-binding capacity—that a human being is a