[ 335 ] 
X. A Critical Study of Spectral Series.—Part V. Phe Spectra oj t!i.e 
Monatomic Gases. 
By W. M. Hicks, F.RB. 
Received November 14, 1918,—Read January 23, 1919. 
[Plates 2-5.] 
Contents. 
Page 
Introduction.336 
Krypton, S .series. 344 
,, links. 347 
,, double displacements.349 
Xenon, S series.350 
„ variability with excitation.350 
,, links.352 
Argon, S series.3oo 
,, links.357 
„ examples of displacement.359 
D and F series. .360 
Krypton, D series.361 
„ abnormal D separations ..363 
„ satellites. 365 
,, F series . 368 
■pi 375 
,, value of the oun. 3(7 
Xenon, D series.381 
„ F and F series.383 
„ source of 1864, 829 separations.393 
,, D series resumed.396 
„ D qualification test. 397, 406 
„ existence of parallel D groups.399 
,, satellite sets. 
„ two groups depending on 79 A 2 , 7 OA 2 .JO-f 
„ parallel F and F series. 
„ Ritz combinations.'^21 
„ value of the oun. 
VOL. CCXX.-A 580. 3 A [PubUsheil May 19, 1920. 
