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 ...

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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 ...