Under the
impulse given me by the thoughts excited by Dr. Whewell, I read again
Sir J. Herschel's _Discourse on the Study of Natural Philosophy_: and I
was able to measure the progress my mind had made, by the great help I
now found in this work--though I had read and even reviewed it several
years before with little profit. I now set myself vigorously to work out
the subject in thought and in writing. The time I bestowed on this had
to be stolen from occupations more urgent. I had just two months to
spare, at this period, in the intervals of writing for the _Review_. In
these two months I completed the first draft of about a third, the most
difficult third, of the book. What I had before written, I estimate at
another third, so that one-third remained. What I wrote at this time
consisted of the remainder of the doctrine of Reasoning (the theory of
Trains of Reasoning, and Demonstrative Science), and the greater part of
the Book on Induction. When this was done, I had, as it seemed to me,
untied all the really hard knots, and the completion of the book had
become only a question of time. Having got thus far, I had to leave off
in order to write two articles for the next number of the _Review_. When
these were written, I returned to the subject, and now for the first
time fell in with Comte's _Cours de Philosophie Positive_, or rather
with the two volumes of it which were all that had at that time been
published.
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