ON WAVE-LENGTH TABLES bP THE SPECTRA OF THE ELEMENTS. 



97 



Silicon (Spakk Spectrum) — continued. 



Argon (Vacuum Tube). 

 The red end of the red spectrum of Argon. 



Runge, ' Astroph. J.,' ix. p. 281. 1899. 

 Eunge and Paschen, ' Astroph. J.,' viii. 99. 1898. 



* These lines belong also to the ' blue spectrum.' 



Nasini, Anderlini, and Salvadori [Accad. Lincei Attv, viii. 269 (1899)] give infra 

 red lines at 7980, 8030, 8140, 8320, 8450, and 8575. 



1901. H 



