Again, the great author of the Evolution theory himself, in his _Descent of Man_, has given us an account of morality which suggests a remark of the same kind. He seems to have come to the conclusion that what is called our moral sense is merely an indication of the superior permanency of social compared with personal impressions. Morality, if we take his explanation as complete and final, is reduced to tribal self-preservation subtilized into etiquette; an etiquette which, perhaps, a sceptical voluptuary, wishing to remove the obstacles to a life of enjoyment, might think himself not unreasonable in treating as an illusion. This, so far as appears, is the explanation offered of moral life, with all its beauty, its tenderness, its heroism, its self- sacrifice; to say nothing of spiritual life with its hopes and aspirations, its prayers and fanes. Such an account even of the origin of morality seems rather difficult to receive. Surely, even in their most rudimentary condition, virtue and vice must have been distinguished by some other characteristic than the relative permanency of two different sets of impressions. There is a tendency, we may venture to observe, on the part of eminent physicists, when they have carefully investigated and explained what seems to them the most important and substantial subjects of inquiry, to proffer less careful explanations of matters which to them seem secondary and less substantial, though possibly to an intelligence surveying the drama of the world from without the distinctly human portion of it might appear more important than the rest. Eminent physicists have been known, we believe, to account summarily for religion as a surviving reminiscence of the serpent which attacked the ancestral ape and the tree which sheltered him from the attack, so that Newton's religious belief would be a concomitant of his remaining trace of a tail. It was assumed that primaeval religion was universally the worship of the serpent and of the tree. This assumption was far from being correct; but, even if it had been correct, the theory based on it would surely have been a very summary account of the phenomena of religious life.