CXlvJ OBSERVATION^. 



These necessarily introduce changes into the table of "Kesults," and from these and other 

 sources slight errors have arisen, which have been corrected in the present computation, as 

 indicated below. The numbers of the lines as cited are counted from the beginnings of the 

 several printed tables of Eesults. 



Page 3, lines 1, 2, far Eight read Nine. 

 5, in Col. Rev. reverse the sign. 



The introduction of these modifications furnishes the following table of observations, as they 

 have been employed for the purposes of the present discussion : 



