Abstract
IN your issue of June 16, Prof. Schuster calls attention to the fact that the wave-length of the aurora line nearly coincides with the wave-length of the bright green line in the spectrum of krypton. Prof. Ramsay and Dr. Travers give the wave-length of this line as 5566˙3. I find it to be 5570˙40 (Rowland's scale), which brings the line close to the mean of the best determinations of the aurora line. According to Scheiner (“Die Spectralanalyse der Gestirne”) the best measures, when reduced to Rowland's scale, are:—
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