260 



REPORT — 1894. 



Barium Oxide and Chloride — continued. 



111 the arc spectrum Kayser and Runge have obtained for the lines 6497, 5536, 

 and 4554, due to metallic barium, the numbers 649893 (153829), 5535-69 (18069.7), 

 and 4,554-21 (21951-6). 



* Due to barium chloride. 



f Due to barium oxide. 



Boron (Spark Spectrum). 



Eder and Valenta : ' Denkschr. math. Wissensch. kais. Akad. Wien,' Bd. 1.x. 1893. 

 Ciamician : ' Sitzber. kais. Akad. Wissensch. Wien,' Bd. Lsxxix. 1890. 



* Observed also by Hartley. 



