Since public lectures seemed to me to present an easy and efficient means of
testing the more or less successful manner of connecting together the
detached branches of any one science, I undertook, for many months
consecutively, first in the French language, at Paris, and afterward in my
own native German, at Berlin (almost simultaneously at two different places
of assembly), to deliver a course of lectures on the physical description of
the universe, according to my conception of the science. My lectures were
given extemporaneously, both in French and German, and without the aid of
written notes, nor have I, in any way, made use, in the present work,
p 10
of those portions of my discourses which have been preserved by the industry
of certain attentive auditors. With the exception of the first forty pages,
the whole of the present work was written, for the first time, in the years
1843 and 1844.
A character of unity, freshness, and animation must, I think, be derived
from an association with some definite epoch, where the object of the writer
is to delineate the present condition of knowledge and opinions. Since the
additions constantly made to the latter give rise to fundamental changes in
pre-existing views, my lectures and the Cosmos have nothing in common beyond
the succession in which the various facts are treated.
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