What was life? No one knew. It was undoubtedly aware of itself, so soon as it was life; but it did not know what it was. Consciousness, as exhibited by susceptibility to stimulus, was undoubtedly, to a certain degree, present in the lowest, most undeveloped stages of life; it was impossible to fix the first appearance of conscious processes at any point in the history of the individual or the race; impossible to make consciousness contingent upon, say, the presence of a nervous system. The lowest animal forms had no nervous systems, still less a cerebrum; yet no one would venture to deny them
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