[226] I would also refer, for subsequent information, to my report of the 1st of October, 1822, made in compliance to a resolution of the Senate, and printed in the Executive Documents of that year, No. 365, 17th Congress, 2d session.
[227] Vide View of the lead mines.
[228] Agreeable to barometric observations made in 1836, by Mr. Nicollet, its true altitude is found to be 1,402 feet above the Gulf of Mexico. Its latitude, by the same authority, is 47° 25´ 23´´.
[229] Thirty years has made it the centre of the new territory of Minnesota, which has now entered on the career of nations.
[230] This object was accomplished by an expedition by Major L. Long, in 1823.
[231] This river was explored by me in 1831 and 1832, in two separate expeditions in the public service, accounts of which have been published in 1831 and 1832, of which abstracts are given in the preceding pages.
[232] Galena has subsequently been made the capital of these mines.
[233] The subjoined petrifaction of a leaf, apparently a species of betula, was obtained on this river. See ante, p. [206].
[234] This metal has subsequently (namely, in 1844) been found to constitute a percentage in the native copper of the Eagle River mines of Lake Superior. Traces of it were found in a mass of native copper found on the shores of Keweena Lake, by Mr. Moliday, in 1826. A mass of pure silver was discovered in a boulder in the drift of Lake Huron, west of White Rock, in 1824. These discoveries induce the belief that this element will be found to be extensively present in the eventual metallurgic operations of the Lake Superior basin.
[235] To the Senate of the United States:—