The Principles of Biology will be followed by the Princi ples of Psychology; that is, Mr. Spencer will pass from the consideration of Life to the study of the Mind. This subject will be regarded in the light of the great truths of Biology previously established; the connexions of life and mind will be traced; the evolution of the intellectual faculties in their due succession, and in correspondence with the conditions of the environment, will be unfolded, and the whole sub j ect of mind will be treated, not by the narrow metaphysical methods, but in its broadest aspect, as a phase of nature's order which can only be comprehended in the light of her universal plan.