Proc.R.D.S.N.S/Vbl.7. 



Plate XVII. 



rig. 4, Th^ three. Priiruxry curves of they Spectnaro of Sodijim/. 



Pa§. & . The. -three, Seoorudjxry ouzves of fh& SpectruTTv of Sodxzuru 



We ist . Newxaa-TL Kth- 



