I. SPECTRUM analysis is now becoming so far-reaching, especially in inquiries having to do with the conditions of the various celestial bodies, that there are many who are anxious to know something of ...

II. Series. MESSRS. RUNGE AND PASCHEN 2 first showed in 1890 that the spectra of lithium, sodium, and potassium were the summation of the spectra of various “series.” Later they have shown that lead ...

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