Terrestrial Magnetism. 



151 



No. 2. Dayton, Ohio, Lat. 39° 44' JV., Lon. 84° 07' J'T. Jiug. 21, 1840. 



No. 3. Hamilton, Ohio, Lat. 39° 23' JV., Lon. 84° 32' W. Aug. 20, 1840. 



No. 4. Lebanon, Ohio, Lat. 39° 26' N., Lon. 84° 6' W. Aug. 24, 1840. 



* Dip at Dayton, in March, 1838, 71° 22'.75. 



