a plain, palpable and available, to an obscure, impalpable and unavailable form. Any perpetuity, therefore, of matter and of energy which pertains to the present system of things does not carry with it the eternity of that system, nor of its constituents. That system, on the other hand, must have had a definite beginning of some kind. Its very motion involves its finiteness, a point from which it has come and to which it is going. We seem, as the fruit of the discussion, to be entitled to the following propositions.

• (1) All movement as evolution in the Universe is due to unequilibrated forces passing into equilibrium;
• (2) unequilibrated forces cannot start from equilibrated ones;
• (3) unequilibrated forces, involving a perpetual passage into equilibrated ones cannot have existed from eternity;
• (4) they must at length end in equilibrium;
• (5) evolution does not admit the eternity of matter.

§ 10. We wish to impress the thoroughly constructive relations which inhere in matter by a few examples. We need, in the outset, to anticipate the feeling that these relations arise so much from the very nature of the case as to express no purpose. They are so thoroughly reasonable, they rest in so direct a way on primary properties, that when we understand them, we are inclined to feel that they could not have been otherwise. They lie back of human thought, why not of the divine thought! Not so. They should show us rather how profoundly mind pervades matter, and makes the whole physical realm rational. There is no other necessity in things save that which reason puts there.