320 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES’ VOL. 13, No. 14 
predicted and now for the first time it can be stated positively that the 
alternation law of Kossel and Sommerfeld is verified for are spectra 
across the entire table of chemical elements. 
In order to test the displacement law, further study of spark spectra 
is required. Of the chemical elements mentioned above, regularities 
in spark spectra have been published only for potassium,” calcium,* 
scandium’ and manganese. A program of investigations of spark 
spectra has been initiated at the Bureau of Standards in order that 
the structures of these spectra may become known, especially for 
those elements the plan of whose are spectra has now been revealed. 
TABLE I—MOULtrTIPLETsS IN THE ARC SPECTRUM OF VANADIUM 
Multiplet 1. 
4594.10 (60,1) 4577.18 (40, I) 
21760.96 80.47  21841.43 
137.40 
4606.15 (15,1) 4580.40 (40, I) 
21704.03 122.01  21826.04 
186.07 186.08 
4645.98 (1, IIIA) 4619.79 (25,1) 4586.37 ~— (50, 1) 
21517.96 122.00 21639.96 157.59 21797.65 
229 .54 
4635.18 (15, I) 
21568 .11 
Multiplet 2. 
4851.51 (40, I) 4832 .43 (30, I 4799 .70 (5, ITA) 
20606 .41 81.84 20687.75 104.68  20828.43 
187 .83 137 .31 
4864 .73 (40, I) 4831.64 (35, I) 4784.50 (5, ITA) 
20550 .42 140.70 20691.12 203.90 20895 .02 
186.00 185.90 
4875.47 (40, I) 4827.45 (30, 1) 
20505.12 204.00 20709 .12 
229.53 
4881.55 (50, 1) 
20479 .59 
23 Nissen, Astroph. Journ. 57: 185. 1923. 
