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it towards a doctrine of evolution; and hence the success of Spencer. But time, which is everywhere in modern science the chief variable, is only a time-length, indefinitely and arbitrarily divisible. There is no genuine duration, nothing really tending to evolution in Spencer's evolution: no more than there is in the periodic working of a turbine or in the stationary tremble of a diapason. Is not this what is emphasised by the perpetual employment of mechanical images and vulgar engineering metaphors, the least fault of which is to suppose a homogeneous time, and a motionless theatre of change which is at bottom only space? "In such a doctrine we still talk of time, we pronounce the word, but we hardly think of the thing; for time is here robbed of all effect." ("Creative Evolution", page 42.) Whence comes a latent materialism, ready to grasp the chance of self-expression. Whence the automatic return to the dream of universal arithmetic, which Laplace, Du Bois-Reymond, and Huxley have expressed with such precision. (Ibid., page 41.) In order to escape such consequences we must, with Mr Bergson, reintroduce real duration, that is to say, creative duration into evolution, we must conceive life according to the mode exhibited with regard to change in general. And it is science itself which calls us to this task. What does science actually tell us when we let it speak instead of prescribing to it answers which conform to our preferences? Vitality, at every point of its becoming, is a tangent to physico-chemical mechanism. But physico-chemistry does not reveal its secret any more than the straight line produces the curve. Consider the development of an embryo. It summarises the history of species; ontogenesis, we are told, reproduces phylogenesis. And what do we observe then? Now that a long sequence of centuries is contracted for us into a short period, and that our view is thus capable of a synthesis which before was too difficult, we see appearing the rhythmic organisation, the musical character, which the slowness of the transitions at first prevented us from seeing. In each state of the embryo there is something besides an instantaneous structure, something besides a conservative play of actions and reactions; there is a tendency, a direction, an effort, a creative activity. The stage traversed is less interesting than the traversing itself; this again is an act of generating impulse, rather than an effect
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