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In continuation of previous accounts of the active modification of nitrogen, and of the spectrum of the afterglow which is associated with it, the present paper gives further details of hte spectra which are developed when various elements and compounds are introduced into the glowing gas. Preliminary investigations of the spectra were made by direct observation, and with a small quartz spectrograph, and when greater resolving power was required a larger quartz spectrograph and an instrument of the Littrow type were used. The arrangments for producing the afterglow were as described in the previous papers. By means of a mechanical pump a stream of purified nitrogen at low pressure was passed through the discharge tube, and the afterglow was observed in a side tube, into which the various substances were introduced as required. It will be remembered that a discharge with condenser and spark gap is necessary to develop the afterglow with maximum intensity.

Spectroscopic investigations in connection with the active modification of nitrogen. II―Spectra of elements and compounds excited by the nitrogen