Cleveite and other new Gas Lines in the Hottest Stews. 6& 



drawn, amount to upwards of fifty, and there can be no doubt that 

 some of them represent gases not yet discovered on the earth. It 

 may also be stated that these gases behave differently as regards 

 their range of visibility through stars of varying temperatures. 



The accompanying map shows the principal lines in the spectrum 

 of Bellatrix, and indicates those which are due to hydrogen, helium, 

 and asterium. The two probable new series which have been found 

 by Dr. Lockyer are also shown. 



The New Gas in £ Puppis. 



Professor E. C. Pickering has recently announced* that the 

 spectrum of Puppis contains a new series of lines, which he at first 

 supposed to be due to some new element. In a second communica- 

 tion to the same journal,f he pointed out that he had reason to 

 suppose that this new series was in some way connected with, 

 hydrogen, since he found that the observed lines occupied the same 

 positions as those computed from the same formula and constants, 

 from which the ordinary series of hydrogen was calculated, but using 

 odd values of n instead of even values. 



In the following table I have brought together all the lines 

 published by Professor Pickering as belonging to the spectrum of 

 this star, ranging them in different columns for greater clearness : — - 



Lines in the Spectrum of Puppis. 



Hydrogen. 



Other lines with origins. 



Old Series 

 (dark). 



New Series 

 (dark). 



Dark. 



Bright. 



3798-1 

 3835 -5 

 3889-1 

 3970 -2 

 4101 -8 

 4340-7 

 4861 -5 



3783 -4 

 3815-9 

 3858-6 

 3924 -8 

 4026-8 

 4200-4 

 4544-0 



3933 Ca 



4472 He 



4505 unknown 



4620 



4633 



4688 



4698 unknown 

 5652 



In his first communication, Professor Pickering mentions lines at 

 4698, 4652, 4620, and 4505, but he does not refer to the first three in 

 his second paper. The line 4505 was at first taken to be one of the 

 components of the new series, but this seems to have been subse- 



* ' Astrophysical Journal,' to!. 4, p. 369. 

 f 'Astrophysical Journal,' vol. 5, p. 95. 



