153 Terrestrial Magnetism. 



No. 5. Mason, Ohio, Lat. 39° 22' .AT., Lon. 84° 13' W. Aug. 25, 1840. 



JVo. 6. Cmcinnati, Ohio, Lat. 39° 6' JV., Lon. 84° 27' W. .Bug. 26, 1840. 



