naturalist's point of view, it cannot fail to be highly significant that the mental attitude toward death should from the first have assumed this form, that the human soul should from the start have felt itself encompassed not only by the endless multitude of visible and tangible and audible things, but also by an Unseen World. In view of this striking fact it is of small moment that the earliest generalizations which in course of time developed into a world of ghosts and demons were grotesquely erroneous. Primitive theorizing is sure to be faulty and in the light of later knowledge comes to seem absurd and bizarre. Such has been in modern days the fate of the savage's ghost-world, along with the Ptolemaic astronomy, the doctrine of signatures, and many another sample of the "wisdom of the ancients." But the fact that primitive man mis-stated his relation to the Unseen World in no wise militates against the truth of his assumption that such a world exists for us.

To this question as to the truth of the assumption I shall return in the sequel. We have very briefly sketched the manner of its origination, and here we may leave this part of our subject with the remark that the belief in a future life, in a world unseen to mortal eyes, is not only coeval with the beginnings of the human race but is also coextensive with it in all its subsequent stages of development. It is in short one of the differential attributes of humanity. Man is not only the primate who possesses articulate speech and the power of abstract reasoning, who is characterized by a long period of plastic infancy and a corresponding capacity for progress, who is grouped in societies of which the primordial units were clans; he is not only all this, but he is the creature who expects to survive the event of physical death. This expectation was one of his acquisitions gained while attaining to the human plane of existence, and the interesting question in the natural history of man is whether it is to be regarded as a permanent acquisition, or is rather analogous to the organ that subserves, perhaps through long ages, an important but temporary purpose, after the fulfilment of which it dwindles into a rudiment neglected and forgotten.

I do not overlook the existence of divers theological systems in which the attitude toward a future life is very different from that with which our Christian education has made us familiar. We sometimes hear such systems cited as exceptions to the alleged universality of the human belief in immortality. The Buddhist looks forward through myriads of successive sentient existences to a culminating state of Nirwana, which if not actual extinction is at least complete quiescence, the absolute zero of being. It hardly needs saying, however, that Buddhistic theology, though it may have arrived at such a zero through long flights of metaphysical reasoning, is nevertheless based in all its foundations upon the primitive belief in man's survival of death. Sometimes it is said that the Jews of the Old Testament times had no proper conception of immortality. It can hardly be maintained, however, that such stories as that of the conversation at Endor between the living Saul and the dead Samuel could emanate from a people destitute of belief in a life after death. In point of fact ancient Jewish thought abounds in traces of the primitive ghost-world. It is only by contrast with the glorious and inspiring Christian development of the belief in immortality that the earlier dispensation seems so jejune and meagre in its faith. There was little to arouse religious emotion in the dismal world of flitting shadows, the Sheol or Hades from which the Greek hero would so gladly have escaped, even to take the most menial position in all the sunlit world. Greek and Hebrew thought, in what we call the classic ages, stood alike in need of religious revival. The mythic lore of the Greek mind had flowered luxuriantly in æsthetic fancies, while the spiritual life of Judaism languished amid strict obedience to forms and precepts. The far-reaching thoughts of Greek philosophers and the lofty ethics of Hebrew preachers were divorced from the primitive ghost-world, even as the mental processes of the modern scholar are separated by a great gulf from those of the woman who comes to scrub the floor. The advent of Christianity fused together the various elements. The doctrine of a future life was endowed with all the moral significance that Jewish thought could give to it, and with all the mystic glory that Hellenic speculation could contribute, so that the effect upon men was that of a fresh revelation of life and immortality through the gospel. Grotesque and hideous features also were brought in from the ghost-worlds of the classic ages, as well as from that of the Teutonic barbarians, and the result is seen in mediæval Christianity. At no other time, perhaps, has the Unseen World played such a leading part in men's minds as in the twelfth and thirteenth centuries of our Christian era, in the age that witnessed the culmination of sublimity in church architecture, in the society whose thought found comprehensive expression in the "Summa" of St. Thomas, as the thought of our times is expressed in Spencer's "First Principles," in an intellectual atmosphere, which just as it was about passing away was depicted for all coming time in the poem of Dante. It was a time of spiritual awakening such as mankind had never before witnessed, but it was also an age of new problems, an age wherein the seeds of revolt were thickly germinating. The nature and constitution of the Unseen World had been too rashly and too elaborately set forth in theorems born of the slender knowledge of primitive times, and the growing tendency to interrogate Nature soon led to conclusions which broke down the old edifice of thought. In the sixteenth century came Copernicus and administered such a shock to the mind as even Luther's defiance of the papacy scarcely equalled. In recent days, when Bishop Wilberforce reckoned without his host in trying to twit Huxley with his monkey ancestry, our minds were getting inured to all sorts of audacious innovations, so that they did not greatly disturb us. For its unsettling effects upon time-honoured beliefs and mental habits the Darwinian theory is no more to be compared to the Copernican than the invention of the steamboat is to be compared to the voyages of Columbus. We are in no danger of overrating the bewilderment that was wrought by the discovery that our earth is not the physical centre of things, and that the sun apparently does not exist for the sole purpose of giving light and warmth to man's terrestrial habitat. We need not wonder that in conservative Spain scarcely a century ago the University of Salamanca prohibited the teaching of the Newtonian astronomy. We need not wonder that Galileo should have been commanded to hold his tongue on a topic that seemed to cast discredit upon the whole theology that assumes man to be the central object of the Divine care.

This unsettling of men's minds was of course indefinitely increased by the revolt of Descartes against the scholastic philosophy, by Newton's immense contributions to physics, and by such discoveries as those of Harvey, Black, and Lavoisier, which showed by what methods truth could be obtained concerning Nature's operations, and how different such methods were from those by which the accepted systems of theology had been built up. The result has been