"said to be [180] miles long, and [45] in width, composed of solid rock salt." OK, it doesn't actually exist, but Thomas Jefferson thought it did; see also here. The rumor may have been started by Zebulon Pike -- not, despite his name, a Star Trek alien (as Sasha has pointed out), but rather the explorer for whom Pikes Peak was named.
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The kids laugh when I tell them some of the thing TJ thought might be out there. But I try to remind them that the very first dinosaurs were only then being found in England. And TJ and co's knowledge of chemistry would have extended to air, earth, fire, and water.
Science was quite different then. We are able to laugh at their ignorance only because they and their successors did the work so that we could know.
(And, yes, the history of natural history is a passion of mine.)
The following citation is from:
Annals Of The Congress Of The United States ebates And Proceedings In The Congress Of The United States; With An Appendix, Containing Important State Papers And Public Documents, And All The Laws Of A Public Nature; With A Copious Index. Printed And Published By Gales And Seaton. Eighth Congress - Second Session: November 5, 1804, To March 3, 1805. Pub 1852 (Google Books link). (any transcriptions errors are mine)
It is good to see evidence that not all economic delusions sprang from Marx.
I think you or Sasha are conflating Zefram Cochrane (human discover of warp drive) and Captain Christopher Pike (captain of the Enterprise prior to Kirk). I do not believe there was a Zebulon Pike character in any of the Star Trek TV shows.
That is, although I don't know for sure, not having perused that part of Jefferson's history, I would strongly suspect Jefferson's understanding of chemistry was considerably more sophisticated than Plato's four elements.
It's also worth noting that Jefferson had a strong interest in refuting the great Buffon's rather contemptuous assertion about the size of New World fauna. Inasmuch as Jefferson was an enthusiast at practically everything he did, it would probably be easy for him to swallow a few Paul Bunyan tall tales about the American West if it suited his geopolitical longings (e.g. to put a finger in Buffon's aristocratic eye).
...horribly injured, and confined, apparently, to a rolling steam cabinet.
Lavoisier?! Like I can afford cognac!