ON WAVE-LENGTH TABLES OF THE SPECTRA OF THE ELEMENTS. 321 



Strontium Oxide. 



OXYHTDBOGEN (FLAME SpECTBUM). 



Hartley: 'Phil. Trans.' clxxxv. 179 (1894). 



* Kayser and Runge record lines in the arc-spectrum of strontium at 5543-49, 

 4607-52, 4226-91, and 407788. 



Barium Oxide. 



OXYHYDROGEN (FLAME SPECTRUM ). 



Hartley : ' Phil. Trans.' clxxxv. 180 (1894). 



Wave-length 



57201 

 5712 J. 

 5697] 



6690 

 5660 

 5619-5 



5587 

 5555 

 5499 

 6544 

 6603 



Intensity and 

 Character 



2b 



strong band 

 (overlap- 

 ping a weak 

 one) 



Oscillation 

 Frequency 

 in Vacuo 



f 17478 

 < 17503 

 Ll7546 



17570 

 17662 

 17790 



/ 17895 

 17997 

 18178 

 18032 

 18165 



Wave-length 



5384 

 5356 

 5322 

 5221 

 5162 

 5089 

 4932 

 4887 

 4862 

 4833 

 4715 

 4692 



} 



-5/ 



1 



Intensity and 

 Character 



Oscillation 

 Frequency 

 in Vacuo 



b very faint 



f 18567 



1.18666 



( 18784 



\ 19149 



r 19368 



"1 19642 



20269 



/ 20456 



I 20559 



20684 



21202 



21306 



Magnesium Oxide. 



OXYHYDROGEN (FLAME SPECTHUM). 



Hartley : 'Phil. Trans.' clxxxv. 181 (1894). 



1895. 



