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If such possibilities are open to the empiricism of the hypnotist, what may we not await from any truly scientific knowledge of mind, comparable even in low degree to our knowledge of, say, electricity?

But these in a sense are all details, relevant in a way, and yet only details. There is something still more fundamental in the biologist’s attitude. He has to study evolution, and in that study there is brought home to him, more vividly than to any one to whom the facts are not so familiar, that in spite of all appearances to the contrary there has been, throughout the whole of evolution, and most markedly in the rise of man from his pre-human forbears, a real advance, a progress.

He sees further that the most remarkable single feature in that progress has been the evolution of self-consciousness in the development of man. That has made possible not only innumerable single changes, but a change in the very method of change itself; for it substituted the possibility of conscious control of evolution for the previous mechanism of the blind chances of variation aided by the equally blind sifting process of natural selection, a mechanism in which consciousness had no part.

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