PEOF. W. M. HICKS: A CRITICAL STUDY OF SPECTRAL SERIES. 



73 



The case NaS (6) is not included, as there is strong evidence that the readings are 

 not correct. There is some indication also of the same for KP(5). The formula is 

 bad for the top line of the KS series, and this must be specially considered in the 

 sequel. With this exception the agreement is remarkable. 



Preliminary Discussion of Formulce Constants. 



Table II. gives the various constants determined under the conditions described 

 above. The possible maximum variations are given in all cases where K.R. give 

 possible errors of observations. Where these are given in brackets the numbers show 

 how the last digits in the constant are affected. Thus in NaP //, = 1 '148678 (477). 

 This means that /x may differ from T148G78 by any amount less than "000477. It is 

 to be understood that in any one formula the top and bottom signs go together. 

 Thus if NaP(oo) be taken as 4144G7G + l'G9, JJL must be 1'148678-- '000477, and so 

 on. It should also be noted that the variations in P, ^, a are not necessarily pro- 

 portional, i.e., if the error in P( oo) is one-half of l'G9, the corresponding errors in p., a 



TABLE II. -Formulae Constants. 



VOL. CCX. A. 



