580 



Profs. Liveing and Dewar. 



[June 17,, 



Wave-lengths of other Lines in Spectrum. No. 2. 



2869-5 



2910 



2947 



2991 



3031 



2872-5 



2913 



2951 



2994 



3039 



2876 



2917-5 



2955 



2999 



3042 



2880 



2922-5 



2959 



3002 



3046 



2883 



2925*5 



2966 



3005 



3051 



2887-5 



2929 



2967-5 



3010 



3057-5 



2892 



2932-5 



2970-5 



3013 



3246 



2895 



2935-5 



2975-5 



3017 



3271 



2897 



2940 



2981 



3019-5 



3429-5 



2904 



2943 



2989 



3029 



3473 



2907-5 



Wave-lengths of other Lines in Spectrum. No. 3. 

 3872 3890 4310 



XV. " On the Spectrum of Water/' By G. D. Liveing, M.A., 

 F.R.S., Professor of Chemistry, and J. Dewar, M.A., F.R.S., 

 Jacksonian Professor, University of Cambridge. Received 

 June 17, 1880. 



In our last communication to the Society, " On the Spectrum of the 

 Compounds of Carbon with Hydrogen and Nitrogen, No. II," we 

 noticed that a remarkable series of lines, extending over the region 

 between the lines S and R of the solar spectrum, were developed in 

 the flame of coal-gas burning in oxygen. The arrangement of lines 

 and bands, of which this spectrum consists, is shown in the accompany- 

 ing diagram,* fig. 1. It begins at the more refrangible end with two 



Fig. 1. 



.strong bands, with wave-lengths about 3062, 3068, and extends up to 

 about the wave-length 3210. It is well developed in the flame of hydro- 



* This diagram gives tolerably well the general character of the spectrum, but 

 the artist has not in all cases correctly rendered the relative strength of the lines. 

 Those of the less refrangible half are almost too strongly rendered. 



