In a former paper (Ludlam and West, Proc. Roy. Soc. Edin., xliv, 185) the emission spectra of the halogens in the ultra-violet region were described and discussed. In connection with the work at that time the flame produced by the union of hydrogen and chlorine was photographed in the hope of gaining some insight into the processes involved and the nature of the energy changes attending the combination. The photograph obtained showed a continuous spectrum in the visible fading rapidly in the violet.