Jack — Magnetic Resolution of the Spectrum Lines of Niobium. 59 



•of components predominate with an even valency, and even numbers of 

 components with an odd valency. The following table shows the result : — 



Table XII. 



Valency 



Components 



■ V^ilei.cy 



r(jn]poiients 



1 



Cu(8), Ag(8) 







11 



Mg(7'-, 9), Zn(9), Cd(9), Ba(82) 

 Hg(72,, 8?, 93, 13, 14) 



III 



A1(S), Y(82, 9^ 10, 12) 

 Th (7, 8', 9, 102, IP, 



T 

 12'- 



(8), 

 142) 



IV 



Zr(7', 8S 9-, 11-) 



III or V 



Nb (S», 102) 







II or VI 



Cr(7or8, 9, 15), Mo (7', 9, U), 

 ^(7, 9, 11, 132, 15, 17, \r-) 



V. — Conclusions. 



(1) The Zeeman Effect in niobium has been completely investigated 

 throughout the whole of the spectrum which could be photographed. 



(2) The spectrum contains very many triplets, included among which are 

 some of the type first observed by Becquerel and Deslandres. 



(3) Some equal differences between the frequencies of some of these have 

 been found ; but no relation connecting those differences has been discovered. 



(4) For all lines with more than three components the separations have 

 been given as multiples of the aliquot parts of the "' normal interval." 



In general, the denominators are small, and the agreement so close that 

 the Eunge rule certainly holds. In some cases the denominators are large, 

 and the applicability becomes uncertain, though in some of these also the 

 rule assuredly applies. 



(5) The Eitz law has been applied to lines with many components. In 

 many cases it suits very well, and gives an apparently simple relation between 

 the intervals. Sometimes, however, the agreement is not very close; and in 

 other cases it is necessary to assume that many components have disappeared 

 through lack of intensity. Thus, where the law holds it connects the intervals 

 in a simple form, but it is not so generally applicable as the Eunge rule. 



(6) It has been shown that for most lines with many components if a very 

 small displacement be given to one of the kinds of components, then the 

 separations are multiples with the factors 0, 1, 2, 3 



(7) For substances with odd valencies an even number of components 

 predominates among the lines with many components ; foi' those with even 

 valencies an odd number of components occurs most frequently. 



