Oxygen in the Sun. 



Very strong. 

 Sharp. 



458315 



458745 



4588-05 



4588-92 Very faint. 



4589-40 



4590-00 



4590-95 ( Stron ^ may 

 agree. 



4592-00 

 4592-95 

 4596-20 

 4601-37 

 4607-20 



I 



Strong. 

 Very strong. 



4609-45 ( Sharp ' may 



Faint. 



Strong, agrees. 

 Strong. 

 Very strong. 

 Sharp. 

 Strong. 

 Rather faint. 

 Fairly strong. 

 Strong. 

 Faint. 

 Strong. 

 Fairly strong. 

 Faint. 



4612-75 

 4614-05 

 4621-42 

 4630-73 

 4634-00 

 4638-90 

 4640-75 

 4641-90 

 4643-45 

 4645-40 

 4649-25 

 4651-02 

 4654-10 

 4654-85 

 4655-90 

 4658 05 

 4659-60 

 4665-70 

 4667-55 

 4671-65 

 4672-30 

 4673-30 



Faint band. 

 Very faint. 



Faint. 



Very faint. 



4674-95 {*°4« 



467640 j 



4681-10 



4682-40 



4687-15 



4688-80 



4691-40 



4694-15 



4695-15 



4696-70 



4699-40 



4700-40 



470165 



470302 



4705-42 



4710-20 



4712-87 



4719-92 



4731-27 



473395 



4740-20 



4744-20 



4753-82 



4760-07 



4763-82 



4771-82 



4775-07 



4782-62 



4788-27 



4791-32 



4798-97 



4800-82 



4802-37 



4808-94 



4810-02 



4811-92 



4813-52 



4816-60 



4820-90 



Faint, may 



agree. 

 Very faint. 



Strong. 

 Faint. 

 Very faint. 

 Broad and faint 

 Faint. 



Agrees. 

 Fairly strong. 



Very faint. 



Sharp. 



Very strong. 

 Very faint. 

 Sharp, agrees. 

 Very faint. 



Very strong. 

 Yery faint. 

 Faint. 



Very strong. 

 Faint. 



4822-12 

 4825-12 

 4842-00 

 4863-92 

 4877-70 

 4878-80 

 4879-90 

 4891-27 

 4894-90 

 4898-70 

 4906-77 

 4907-67 

 4913-69 

 491512 

 4916-86 

 4936-86 

 4940-85 

 494501 

 4945-81 

 4950-21 

 4951-41 

 4953-85 

 4955-16 

 4960-16 

 4969-85 

 4972-85 

 497990 



4983-06 



4993-95 

 4997-60 

 4999-31 

 5001-55 

 501106 

 5012-50 

 5018-55 



307 



Faint. 



Faint, may agree. 



Faint but sharp. 



Faint. 

 Very faint. 



Sharp. 



Sharp, but faint. 



Sharp. 



Band. 



Sharp. 



Nebulous band. 

 Sharp, agrees. 



[ Sharp, may 

 \ agree. 

 Faint. 



Agrees. 

 Faint. 



Sharp, agrees. 

 Faint. 

 May agree, 

 f Faint, may 

 \ agree. 

 5033-85 Very faint. 



502295 



In regard to the accuracy that may be expected of the above 

 positions, we feel sure that few of them are wrong by more 

 than a tenth of a wave-length, and these are of the class 

 "Very faint," or tl Broad and nebulous." The better defined 

 lines we believe to be correct to within less than the above 

 amount. The method of comparison we have used admits of 

 much greater accuracy than this, but the ill-defined character 

 of the air-lines puts a limit to their accurate placing. Com- 

 pared with Thalen's positions, they should be credited with 

 ten times the accuracy at least. Some of Thalen's bands are 

 resolved into two or more in our instrument. 



Prof. John C. Draper projected his spectra upon a scale of 

 wave-lengths by means of a stereopticon — a method which 

 does not inspire confidence in his results, when we consider 

 the distortion produced by projecting-lenses. 



The scientific world seems largely to have accepted the 



