Transactions of the American Philosophical Society . horeto the great secondary basin of the Mississippi, with the comparative ele-vation of the range of mountains called in general the Alleghany. Thescale of height on the margin is divided into ten parts; the first five is twohundred feet each, to give some apparent height to the small hills and lowcountry; the upper half of the scale is equally divided into five, and is onethousand feet, each division; making the whole scale six thousand feet. Itis not meant that the highest part of the ridge shall he found exactly wherethe line passes, hut
Transactions of the American Philosophical Society . horeto the great secondary basin of the Mississippi, with the comparative ele-vation of the range of mountains called in general the Alleghany. Thescale of height on the margin is divided into ten parts; the first five is twohundred feet each, to give some apparent height to the small hills and lowcountry; the upper half of the scale is equally divided into five, and is onethousand feet, each division; making the whole scale six thousand feet. Itis not meant that the highest part of the ridge shall he found exactly wherethe line passes, hut that the highest part of the ridge in the vicinity of thatline, shall must probably be found of the height marked by the scale in thesection. The colours correspond with those on the map; that is, the Siena for therock, red for the transition, the blue for the secondary, and the yellow forthe alluvial, &r. The Catskill mountains are here represented as transition, though inmany places west of the Hudson the transition is found only on the lower. No. II. Astronomical Observations, &c. communicated by AndrewEllicott, Esq.—Read Nov. lQth, 1810. Lancaster, Nov. 14th, 1810. I BELIEVE none of the following observations have asyet been communicated to the Philosophical Society. Observations on the Eclipse of the Moon, Jan. Uh, 1806. The beginning of the eclipse could not be observed, theMoon being covered by clouds. The end was observed asfollows: Moons limb visible through the penumbra at 8h 15 07 . Moons limb clear of the penumbra at - 8 17 12 j Apparent time. Observatio?is on the Eclipses of Jupiters Satellites. 1806 July 5th Emersion of the 3d Satellite observed at 7h 53 171 Do. do. 2d do. 10 44 7 Aug. 5th do. 1st do. 11 21 15 6th do. 2d do. 10 20 18 VMean time, 21st do. 1st do. 9 40 42 Sept. 6th do. 1st do. 8 0 44 13th do. 1st do. 9 56 21 J 1807 July 31st at 9h 53 18 the 2d Satellite of Jupiter was observed emerging from behind the body of the planet, but was not completely eme
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