SCIENT. PROC. R. DUBLIN SOC, N.S., VOL XIIL 



PLATE XXn. 



Pb 

 PbCl„ 



Mn 

 Mn CJ^ 



Fe 



Feci, 



CaCl, 

 SrCl, 



BaC)^ 



Li CI 



Li 



MgCl, 



Ni 

 NiCl, 



Co 



C0CI3 



Jt 



Cr 



Cr OX]„ 



aooo 5000 4000 



METALLIC VACUUM TUBE SPECTRA. 



Wave length Scale. 



3000 a S 7 B S 4 3 



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