[20] Spencer's proof of his 'Transfigured Realism' (his doctrine that there is an absolutely non-mental reality) comes to mind as a splendid instance of the impossibility of establishing radical heterogeneity between thought and thing. All his painfully accumulated points of difference run gradually into their opposites, and are full of exceptions. [Cf. Spencer: _Principles of Psychology_, part VII, ch. XIX.] [21] I speak here of the complete inner life in which the mind plays freely with its materials. Of course the mind's free play is restricted when it seeks to copy real things in real space. [22] [But there are also "mental activity trains," in which thoughts do "work on each other." Cf. below, p. 184, note. ED.] [23] [This topic is resumed below, pp. 137 ff. ED.] [24] [_Principles of Psychology_, vol. I, pp. 299-305. Cf. below, pp. 169-171 (note).] II A WORLD OF PURE EXPERIENCE[25] It is difficult not to notice a curious unrest in the philosophic atmosphere of the time, a loosening of old landmarks, a softening of oppositions, a mutual borrowing from one another on the part of systems anciently closed, and an interest in new suggestions, however vague, as if the one thing sure were the inadequacy of the extant school-solutions. The dissatisfaction with these seems due for the most part to a feeling that they are too abstract and academic. Life is confused and superabundant, and what the younger generation appears to crave is more of the temperament of life in its philosophy, even though it were at some cost of logical rigor and of formal purity. Transcendental idealism is inclining to let the world wag incomprehensibly, in spite of its Absolute Subject and his unity of purpose. Berkeleyan idealism is abandoning the principle of parsimony and dabbling in panpsychic speculations. Empiricism flirts with teleology; and, strangest of all, natural realism, so long decently buried, raises its head above the turf, and finds glad hands outstretched from the most unlikely quarters to help it to its feet again. We are all biased by our personal feelings, I know, and I am personally discontented with extant solutions; so I seem to read the signs of a great unsettlement, as if the upheaval of more real conceptions and more fruitful methods were imminent, as if a true landscape might result, less clipped, straight-edged and artificial.