422 



REPORT — 1884. 



Magnesium — continued. 



Becquerel has observed the following infra-red lines in the Arc Spectrum of 

 Magnesium: 8990, 10470?, 12000 (probably double) and 12120— the last three 

 presenting the aspect of the group b. 



Manganese. 



* Observed, together with the Bands of Manganese Oxide, by Lecoq de Boisbaudran in the Spark 

 Spectrum of Manganese Chloride solution. 



t Observed also by Lockyer ; the 'iudices' attached to these numbers denote the comparative 

 •lengths' of the lines. 



|| ' Could not lie identified,' Lockyer. 



