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A fubftance, fuppofed to be Pumice, found floating on the Miflifipi, has induced a conjefture, that there is a volcano on fome of its waters: and as thefe are moftly known to their fources, except the Miflburi, our expedations of verifying the conjecture would of courfe be led to the mountains which divide the waters of the Mexican Gulf from thofe of the South Sea; but no volcano having ever yet been known at fuch a diftance from the fea, we muft rather fuppofe that this floating fub- ftance has been erroneoufly deemed Pu- mice.