OX WAVE-LENGTH TABLES OF THE SPECTRA OF THE ELEMENTS. 443 



Silver — cuntin ued. 



Sodium. 



Observed also by Lecoq de Boisbandran in the Spark Spectrum of Sodium Sulphate- 

 t Observed by Lockyer. The 'indices' attached to these numbers denote the comparative 'lengths' 

 of the lines. 



