444 



KEPoirr— 1884. 



Sodium — continued. 



Becquerel has observed infra-red lines at 8190 and 11420 in the Arc Spectrum of 

 Sodium. 



Strontium. 



• Observed by Lecoq de Boisbaudran, together with the bands of Strontium Oxide, in the Spark 

 Spectrum of solution of Strontium Chloride. 



t Observed also by Lockyer : the 'indices' attached to these numbers denote the comparative 

 ' lengths ' of the lines. 



X See Barium. § See Calcium. || See Iron. T See Manganese. 



