we are here concerned with energies and mysteries which are loftier, grander and doubtless fraught with graver consequences, since they affect our eternal destinies, traverse alike our life and our death and extend beyond our planet. 15 It is not true therefore that the psychical sciences have said their last word and that we have nothing more to expect from them. They have but just awakened or reawakened; and, to postdate Guyau's prediction by a hundred years, we might say, with them in our minds, that the twentieth century "will end with discoveries as ill-formulated but perhaps as important in the moral world as those of Newton and Laplace in the astronomical world." But, though we have much to hope from them, that is no reason why we should look to them for everything and abandon in their favour that which has brought us where we are. The choice of which we spoke, between the brain and the subconsciousness, has been made long ago; and it is not our part to make it over again. We are carried along by a force acquired in the course of two or three thousand years; and our methods, like our intellectual habits, have of themselves become transformed into sort of minor subconsciousness superposed upon the major subconsciousness and sometimes mingling with it. Henri Bergson, in his very fine presidential address to the Society for Psychical Research on the 28th of May, 1913, said that he had sometimes wondered what would have happened if modern science, instead of setting out from mathematics, instead of bringing all its forces to converge on the study of matter, had begun by the consideration of mind; if Kepler, Galileo and Newton, for instance, had been psychologists: "We should certainly," said he, "have had a psychology of which to-day we can form no idea, any more than before Galileo we could have imagined what our physics would be; a psychology that probably would have been to our present psychology what our physics is to Aristotle's. Foreign to every mechanistic idea, not even conceiving the possibility of an explanation, science would have enquired into, instead of dismissing a priori facts, such as those which you study; perhaps 'psychical research' would have stood out as its principal preoccupation. The most general laws of mental activity once discovered (as, in fact, the fundamental laws of mechanics were discovered), we should have passed from mind, properly so-called, to life; biology would have been constituted, but a vitalist biology, quite different from ours, which would have sought behind the sensible forms of living beings the inward, invisible force of which the sensible forms are the manifestations."