Spencer, H. (1880). The law of evolution. In H. Spencer, World's famous literature. First principles (pp. 259-277). Philadelphia, PA, US: David McKay Publisher.
http://dx.doi.org/10.1037/12424-019
Deduction has now to be verified by induction. Thus far the argument has been that all sensible existences must, in some way or other and at some time or other, reach their concrete shapes through processes of concentration; and such facts as have been named have been named merely to clarify the perception of this necessity. But we cannot be said to have arrived at that unified knowledge constituting Philosophy, until we have seen how existences of all orders do exhibit a progressive integration of Matter and concomitant loss of Motion. Tracing, so far as we may by observation and inference, the objects dealt with by the Astronomer and the Geologist, as well as those which Biology, Psychology, and Sociology treat of, we have to consider what direct proof there is that the Cosmos, in general and in detail, conforms to this law. In doing this, manifestations of the law more involved than those hitherto indicated will chiefly occupy us. Throughout the classes of facts successively contemplated, our attention will be directed not so much to the truth that every aggregate has undergone, or is undergoing, integration, as to the further truth that in every more or less separate part of every aggregate, integration has been, or is, in progress. Instead of simple wholes and wholes of which the complexity has been ignored, we have here to deal with wholes as they actually exist—mostly made up of many members combined in many ways. And in them we shall have to trace the transformation as displayed under several forms—a passage of the total mass from a more diffused to a more consolidated state; a concurrent similar passage in every portion of it that comes to have a distinguishable individuality; and a simultaneous increase of combination among such individuated portions. (PsycINFO Database Record (c) 2016 APA, all rights reserved)