I should also have added a word of advice regarding the manner of
reading this work, which is, that I should wish the reader at first
to go over the whole of it, as he would a romance, without greatly
straining his attention, or tarrying at the difficulties he may
perhaps meet with in it, with the view simply of knowing in general
the matters of which I treat; and that afterwards, if they seem to
him to merit a more careful examination, and he feel a desire to
know their causes, he may read it a second time, in order to observe
the connection of my reasonings; but that he must not then give it
up in despair, although he may not everywhere sufficiently discover
the connection of the proof, or understand all the reasonings--it
being only necessary to mark with a pen the places where the
difficulties occur, and continue to read without interruption to the
end; then, if he does not grudge to take up the book a third time, I
am confident he will find in a fresh perusal the solution of most of
the difficulties he will have marked before; and that, if any still
remain, their solution will in the end be found in another reading.
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