world at a definite point of time, then we must suppose God Himself to have existed before that creation. We cannot think of an event in time without thinking of a time before it; and time cannot be thought of as merely empty time. Events of some kind there must necessarily have been, even though those events are thought of as merely subjective experiences involving no relation to space. A beginning of existence is, {89} indeed, unthinkable. But there is no difficulty in supposing that this particular series of phenomena which constitutes our physical Universe may have had a beginning in time. On the other hand there is no positive evidence, for those who cannot regard the early chapters of Genesis as representing on such a matter anything but a primitive legend edited by a later Jewish thinker, that it had such a beginning. It is no doubt more difficult to represent to ourselves a beginning of space; and the notion of an empty space, eternally thought but not eternally filled up by any series of phenomena of the space-occupying kind, represents a rather difficult, though not (as it seems to me) an absolutely impossible conception. The question, therefore, whether there was a beginning of the series of events which constitute the history of our physical world must (so far as I can see) be left an open one. Of course if the argument of Lord Kelvin be accepted, if he is justified in arguing on purely physical grounds that the present distribution of energy in the Universe is such that it cannot have resulted from an infinite series of previous physical changes, if Science can prove that the series is a finite one, the conclusions of Science must be accepted.[1] Metaphysic has nothing to say for or against such a view. That is a question of Physics on which {90} of course I do not venture to express any opinion whatever.