Whoever has followed the history of a single science, finds in its development a clue to the understanding of the oldest and commonest processes of all "knowledge and cognizance": there, as here, the premature hypotheses, the fictions, the good stupid will to "belief," and the lack of distrust and patience are first developed—our senses learn late, and never learn completely, to be subtle, reliable, and cautious organs of knowledge. Our eyes find it easier on a given occasion to produce a picture already often produced, than to seize upon the divergence and novelty of an impression: the latter
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