A person upwards of sixty years old, who had recently arrived at one of the highest settlements of the Missouri, inquired of us very particularly of the river Platte, and of the quality of the lands about its source. We discovered that he had the most serious intention of removing with his family to that river. On the last day of July and the first of August, about two inches of rain fell: the prevailing winds were from the north-east; but the superior strata of the atmosphere carried clouds of different descriptions in different, and sometimes opposite directions. The moon soon after rising, passed behind a long dense body of cirrus clouds, that floated over the eastern horizon. Long and distinct radii were soon after seen converging to a point fifteen or twenty of { 99} the moon's diameters to the eastward of its disk. Such is the refracting power of the aqueous vapors sometimes suspended in the atmosphere.
Horizontal strata of sandstone and compact lime stone, are disclosed in the cliffs on both sides the valley of the Missouri. These rocks contain numerous remains of caryophilla, productus, and terebratulæ.[138]
Some days passed after our arrival at Fort Osage, before the weather admitted our making the astronomical observations necessary to ascertain its position. The mean of the results of several observations of the meridian altitude of the sun's lower limb gave 39° 9´ 33-1/2´´ north, for the latitude of the place.
[119] In a letter addressed to Mr. Frazer, an extract from which was published in the tenth volume of the London Journal of Literature and the Arts, Dr. Baldwin mentions having discovered near Monte Video, in South America, the _Solanum Tuberosum_ in its native locality. Mr. Lambert, however, considered this plant as the _Solanum Commersoni_ of Dunal; and though it produces tuberous roots, and in other respects makes a near approach to S. tuberosum, he was not satisfied of their identity, and remarks that it is yet to be proved, that this is the stock from which the common potatoe has been derived. It appears, however, that the original locality of the solanum tuberosum has been ascertained by Ruiz and Pavon, after having escaped the observation of Humboldt and Bonpland.--JAMES.