248 



PROCEEDINGS OP THE AMERICAN ACADEMY 



TABLE II. 



The close agreement of the formula with observation justifies its use 

 for reducing the observations, since, if any deviation is indicated in the 

 results, a correction may be applied to them. Accordingly the curve 

 represented by this formula was drawn upon a large scale, and the 

 wave-lengths corresponding to each reading were taken from it. In 

 Table III. a comparison is given of all the lines measured in the 

 spectrum of the Moon and of Jupiter. The successive columns give a 

 number for reference, and the original screw readings for the {)late3 

 whose numbers head the columns, after applying the correction de- 

 scribed above, which gives for the II line a reading 5.000 in each 

 spectrum. The readings giving the limits to which the spectra could 

 be traced are omitted in this table, except where they indicate known 

 lines. In the latter case they are indicated by Italics. 



TABLE TIL 



