Historically speaking, we know of course that early and primitive folk, letting their imaginations loose, peopled that ‘other side’ and rather promiscuously, with all sorts of fairy beings and phantom processions. Giant grizzly bears, divine jackals, elves, dwarfs, satans, holy ghosts, lunar pitris, flaming sun-gods, and so forth, ruled and raged behind the curtain—in front of which the shivering mortal stood. But as time went on, the growing exactitude of thought and science made it more and more impossible to idly accept these imaginings; and it may be said that about the middle of last century these cosmogonies—for the more thoughtful among the populations of the Western world—finally perished, and gave place for the most part to a simple negative attitude. It was allowed that intelligences and personalities (human and animal) moved on _this_ side of the veil, and were plainly distinguishable as operating in the actual world; but they, it was held, were more or less isolated and probably accidental products of a mechanical universe. That mechanical arrangement of atoms, and so forth, which we could now largely map out and measure, and which doubtless in the future we should be able completely to define—that was the universe, and somehow or other included everything. One of its properties was that it would run down like a clock, and would eventuate in time in a cold sun and a dead earth—and there was an end of it! Any intelligent existence behind or on the other side of this veil of mechanism was too problematical to be worth discussing; in all probability on that side was mere nothingness and vacancy.