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chemistry； the separation of the empirical from the rational
elements that may be found in them； by repeated experiments on
mon sense； we may exhibit both pure； and learn with certainty
what each part can acplish of itself； so as to prevent on the one
hand the errors of a still crude untrained judgement； and on the other
hand （what is far more necessary） the extravagances of genius； by
which； as by the adepts of the philosopher's stone； without any
methodical study or knowledge of nature； visionary treasures are
promised and the true are thrown away。 In one word； science
（critically undertaken and methodically directed） is the narrow gate
that leads to the true doctrine of practical wisdom； if we
understand by this not merely what one ought to do； but what ought
to serve teachers as a guide to construct well and clearly the road to
wisdom which everyone should travel； and to secure others from going
astray。 Philosophy must always continue to be the guardian of this
science； and although the public does not take any interest in its
subtle investigations； it must take an interest in the resulting
doctrines； which such an examination first puts in a clear light。
…THE END…
。