Wherever it has been possible to do
so, I have adduced the authorities from whence I derived my facts, with a
view of affording testimony both to the accuracy of my statements and to the
value of the observations to which reference was made. In those instances
where I have quoted from my own writings (the facts contained in which
being, from their very nature, scattered through different portions of my
works), I have always referred to the original editions, owing to the
importance of accuracy with regard to numerical relations, and to my own
distrust of the care and correctness of translators. In the few cases where
I have extracted short passages from the works of my friends, I have
indicated them by marks of quotation; and, in imitation of the practice of
the ancients, I have invariably preferred the repetition of the same words
to any arbitrary substitution of my own paraphrases. The much-contested
question of priority of claim to a first discovery, which it is so dangerous
to treat of in a work of this uncontroversial kind, has rarely been touched
upon. Where I have occasionally referred to classical antiquity, and to
that happy period of transition which has rendered the sixteenth and
seventeenth centuries so celebrated, owing to the great geographical
discoveries by which the age was characterized, I have been simply led to
adopt this mode of treatment, from the desire we experience from time to
time, when considering the general views of nature, to escape from the
circle of more strictly dogmatical modern opinions, and enter the free and
fanciful domain of earlier presentiments.
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