244 



PROCEEDINGS OF THE AMERICAN ACADEMY 



3. There is evidently discrepancy enough between the tables and 



observation for further investigation. We have 



Cambridge, Eng., 1853 

 Greenwich, 1856 



Paris, 1856 



Cambridge, Mass., 1863 



Correction of Bessel. 



+ 0'.35 

 + 0.26 

 + 0.67 

 + 0.66 



Correction of Dr. Gould. 



+ 0'.64 

 + 0.64 

 + 1.04 

 + 1.22 



All these numbers have the positive sign, and those referring to Dr. 

 Gould's catalogue are the larger. 



4. The mode of investigation which I have now adopted is to com- 

 pare Bessel's Tabula? Regiomontanse with observations of Polaris 

 made at different places during a little more than a century. 



* See Erratum, p. 309 of the Annales, Vol. XVI. of the Observations. 



