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<p>A continuation of previous work [see Abstract 1912A01687]. Regularities have been previously observed by Paulson and by Kiess and Meggers, consisting of constant frequency differences. These are now shown to form part of a regular series scheme. Narrow triplets, separations 121.5 and 87.0 form series IS-/b m/p/sub i/, 2p/sub i/-/b m/S, and 2p/sub i/-/b m/D. Wide triplets, separations 448.5 and 257.5, give Is-/b mp/sub i/ /, 2/b p/sub i/ /-/b ms/, and 2/b P/sub i/ /-/b md/. Parallel to these last are Is-/b mp/sub i/ /+/b k/sub i/ /), (2/b p/sub i/ /-/b k/sub i/ /-/b ms/, and (2/b p/sub i/-k/sub i/ /)-/b md/sub j/ / with separations 379.9 and 233.4. The limits of the series have been calculated from Ritz formulae, and from interseries combination lines. These give for the resonance and ionisation potentials, 3.25 v. and 7.35 v. respectively. Mention is made of Catalan's multiplets, and photographs are given.
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<br>Subjects:</div>
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Kiess, C.C.</div>
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