In every class of persons investigated, the number of believers in God is less and in most classes very much less than the number of non-believers, and that the number of believers in immortality is somewhat larger than in a personal God; that among the more distinguished, unbelief is very much more frequent than among the less distinguished; and finally that not only the degree of ability, but also the kind of knowledge possessed, is significantly related to the rejection of these beliefs. In another connection Prof. Leuba speaking of Christian dogmatism as a whole says: Christianity, as a system of belief, has utterly broken down, and nothing definite, adequate, and convincing has taken its place. There is no generally acknowledged authority; each one believes as he can, and few seem disturbed at being unable to hold the tenets of the churches. This sense of freedom is the glorious side of an otherwise dangerous situation. Your conception of the origin, sustenance and governance of the universe is burdened, as are all interpretations of religion which are hinged upon the existence of conscious, personal divinities, with two difficulties: (1) its physical impossibility, and (2) its moral impossibility. 1. Physical Impossibilities. The atomic and molecular movements required for the thinking of a single man would be beyond the capacity of all the gods of the supernaturalistic interpretations of religion together. Some idea of the number of such motions which are taking place in every human brain, will be derived from the conservative representations of Hofmeister as exhibited in the following condensed form by McCabe in his book, "The Evolution of Mind:" We have reason to believe that there are in each molecule of ordinary protoplasm at least 450 atoms of carbon, 720 atoms of hydrogen, 116 of nitrogen, 6 of sulphur, and 140 of oxygen. Nerve-plasm is still more complex. Recent discoveries have only increased the wonder and potentiality of the cortex. Each atom has proved to be a remarkable constellation of electrons, a colossal reservoir of energy. The atom of hydrogen contains about 1,000 electrons, the atom of carbon 12,000, the atom of nitrogen 14,000, the atom of oxygen 16,000, and the atom of sulphur 32,000. These electrons circulate within the infinitesimal space of the atom at a speed of from 10,000 to 90,000 miles a second. It would take 340,000 barrels of powder to impart to a bullet the speed with which some of these particles dart out of their groups. A gramme of hydrogen--a very tiny portion of the simplest gas--contains energy enough to lift a million tons more than a hundred yards. Of these astounding arsenals of energy, the atoms, we have, on the lowest computation, at least 600 million billion in the cortex of the human brain.