METHODS OF INTERPOLATION. 353 



To secure the gTeatest iiractical facility in making adjustments, uu 

 more figures should be used than are really necessary. 

 AUG-UST, 1874. 



EREATA. 



At age 54 of column (a), in Table I, (Smithsonian Report of 1871, p. 

 287,) for 1.80 read 1.43. The error occurs in the original table in the 

 Massachusetts Report. 



In the foot-note at page 317 of the Smithsonian Report of 1871, for 

 Lionville's read Liouville's. 



23 s 



