64 Mr. J. Norman Lockyer. On the Appearance of the 



quently superseded by the employment of the line about 4544, which 

 agrees better both as regards intensity and the calculated position 

 4543-6. 



The question then arises, what relation does the spectrum of this 

 star bear to those of other stars of high temperature ? 



A comparison of the lines recorded with those in the spectrum of 

 Bellatrix shows that, with the exception of the new series and the 

 lines at 4698, 4688, and 4505, many lines are common, as is indicated 

 in the following table : — 



Comparison of Spectrum of £ Puppis with that of Bellatrix. 



Lines in £ Puppis 

 (Pickering). 



3783-4 

 3798-1 

 3815-9 

 3835-5 

 3858-6 

 3889-1 

 3924-8 

 3933-0 

 3970-2 

 4026-8 

 4101-8 

 4200-4 

 4340-7 

 4472-0 

 4505-0 

 45400 

 4544-0 

 4620-0 

 4633-0 

 4652-0 

 4688-0 

 4698-0 

 4861-5 



Probable coincident 

 lines in Bellatrix. 



3798-1 



3835-5 



3889-1 



3933-0 

 3971 1 



4101-0 



4340-7 

 4471-0 



4541-0 



46200 

 4629-0 

 4650-0 



4861-0 



H new series 



ne. 



H new series 

 H^. 



H new series 

 Hf. 



H new series 

 K. 



He. 



H new series 



m. 



H new series 

 H 7 . 



Helium. 



Unknown. 



Unknown. 



H new series (to 



Unknown. 



Unknown. 



Unknown. 



Unknown. 



Unknown. 



H/3. 



21). 

 19). 

 17). 

 15). 



13). 

 11). 



9). 



From the above it will be gathered that the only really marked 

 difference between £ Puppis and Bellatrix is the presence of this new 

 series of lines in the spectrum of the former. As I have only at my 

 command the published accounts of Professor Pickering and not an 

 original photograph of this star, a more detailed comparison of the 

 spectra cannot be made, but there seems to be evidence which points 

 to a higher temperature for the star than that of Bellatrix. 



Professors Pickering and Kayser both concede that this new form 



