Abstract
I HAVE read with great interest Prof. L. Vegard's recent communication1 on this subject, in which he reports that in the auroral spectrum in the infra-red he has found two bands, a strong one at 7883 A. and a weak one at 8095 A., with sharp edges towards longer wave-lengths. Prof. Vegard considers that if the auroral green line is to be identified with the oxygen line at 5577 A., it is expected that other oxygen triplets, 7772-74-75, 8233-30-22, 7952-50-47, and 7481-79-77, will appear in this region, but none of these could be identified with the observed auroral lines. Taking into consideration the high intensities of these two bands, and the emission of the second positive bands of nitrogen in the auroral spectrum, he has interpreted these two bands as the appearances of the first positive bands of nitrogen with the special distribution of intensity.
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