The experiments of Dr. Maskelyn denote a greater
specific gravity in the central portions of the globe, than in its
crust, and consequently do not favor the theory advocated by Mr. R., of
an interior void. Yet we are advertised, by the phenomena of
earthquakes, that this interior abounds with oxygen, hydrogen gas,
caloric, and sulphur; and that extraordinary geological changes are
effected by their action. It does seem improbable that the proposed
expedition will trace any open connection "with such an interior world;"
but it may accumulate facts of the highest importance. I am not,
therefore, insensible of the high honor of this offer, and however I may
glow with the secret ardor of discovery, and the honor of place, my
present engagements, domestic and public, have woven about me such a
web, that it is impossible suddenly to break from it. On full
consideration and reconsideration, therefore, I declined going.[48]
[Footnote 48: The expedition was, in fact, checked by various causes, and
the project lingered for some years.
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