If so, he is one of the constituent units of an unknown and vaster personality who is composed of Gods, as our God is composed of all the living forms on earth, and as all those living forms are composed of cells. This is the Unknown God. Beyond this second God we cannot at present go, nor should we wish to do so, if we are wise. It is no reproach to a system that it does not profess to give an account of the origin of things; the reproach rather should lie against a system which professed to explain it, for we may be well assured that such a profession would, for the present at any rate, be an empty boast. It is enough if a system is true as far as it goes; if it throws new light on old problems, and opens up vistas which reveal a hope of further addition to our knowledge, and this I believe may be fairly claimed for the theory of life put forward in "Life and Habit" and "Evolution, Old and New," and for the corollary insisted upon in these pages; a corollary which follows logically and irresistibly if the position I have taken in the above-named books is admitted. Let us imagine that one of the cells of which we are composed could attain to a glimmering perception of the manner in which he unites with other cells, of whom he knows very little, so as to form a greater compound person of whom he has hitherto known nothing at all. Would he not do well to content himself with the mastering of this conception, at any rate for a considerable time? Would it be any just ground of complaint against him on the part of his brother cells, that he had failed to explain to them who made the man (or, as he would call it, the omnipotent deity) whose existence and relations to himself he had just caught sight of? But if he were to argue further on the same lines as those on which he had travelled hitherto, and were to arrive at the conclusion that there might be other men in the world. besides the one whom he had just learnt to apprehend, it would be still no refutation or just ground of complaint against him that he had failed to show the manner in which his supposed human race had come into existence. Here our cell would probably stop. He could hardly be expected to arrive at the existence of animals and plants differing from the human race, and uniting with that race to form a single Person or God, in the same way as he has himself united with other cells to form man. The existence, and much more the roundness of the earth itself, would be unknown to him, except by way of inference and deduction. The only universe which he could at all understand would be the body of the man of whom he was a component part.