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Balmer gave some time since, in the case of the hydrogen spectrum, an empirical formula which enabled the rays discovered later by an eminent astronomer, M. Deslandres, to be represented; but since then, both in the cases of line and band spectra, the labours of Professor Rydberg, of M. Deslandres, of Professors Kayzer and Runge, and of M. Thiele, have enabled us to comprehend, in their smallest details, the laws of the distribution of lines and bands.
It was placed under the command of W. O. Hodgkinson, who had already seen considerable experience as an explorer, having been one of the members of the Burke and Wills party, and also a member of M'Kinlay's expedition when he traversed the continent. The second in charge was a mining surveyor and mineralogist, Mr. E. A. Kayzer.
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