278 THE CHEMISTRY OF THE SUN. [CHAP. 



Potassium. There were observed either separately or together 

 a. Line absorption more refrangible than D. 

 ft. As in Sodium. 

 y. The new spectrum. 



An expansion of this research by Professor Roberts and 

 myself added great weight to the views expressed above and con- 

 siderably increased the number of bodies possessing fluted 

 spectra. 



The experimental conditions were varied as follows : The 

 temperature was greatly increased by the employment of an 

 oxyhydrogen blowpipe and a lime still, such as that employed 

 by Stas, but modified so that the metallic vapour might be 

 conducted into a lime-tube or funnel heated to redness, and 

 so placed that a beam from an electric lamp would readily 

 traverse it. 1 



The general results of this investigation may be stated as 

 follows : 



New fluted spectra. 

 Silver. 

 Manganese. 

 Chromium. 

 Bismuth. 

 Selenium. 



Absorption in the blue. 



Silver. 



Manganese (red also). 



Copper. 



Aluminium. 



Cadmium (red also). 



Iron. 



Cobalt. 



Nickel. 



1 Full details of the arrangements will be found in Proc. R. S. No. 160, 1875, 

 and also in Studies in Spectrum Analysis. 



