8 



On the new Gases obtained from Uraninite. [Nov. 21, 



lines which appear to be comparatively unimportant in Yoimg's list 

 •were photographed as important lines. The fifth column indicates 

 probable coincidences with lines in the spectrum of the Orion nebula ; 

 the accuracy of these wave-lengths is of necessity less than in the 

 case of the chromosphere ; with the exception of D 3 they are taken 

 from my paper on the photographic spectrum of the Orion nebula.* 

 The sixth column shows probable coincidences with dark lines in the 

 spectrum of Bellatrix, this being taken as an example of the Orion 

 stars,f the lines 4922'3 and 5015 - 8 have been photographed since the 

 date of the paper to which reference is made. 



The last column gives the wave-lengths, from Mr. Crookes' table, 

 of the lines observed by both of us. 



"Wave-length 

 (Eowland). 



Wave-length 

 (Angstrom). 



Chromo- 

 sphere 

 (Young). 



Eclipses 1893. 

 Max. intens. 

 = 10. 



Orion nebula. 

 Max. intens. 

 = 6. 



Bellatrix. 

 Max. intens. 

 = 6. 



Crookes' 

 measures. 



I 







Frequency 



AR 



AR 



AR 



aR 



7065 '5 



7064 -0 



100 









7065 -5 



6678 '3 



6676-9 



25 









6678 -1 



6371 "6 



6370 *5 



5 











6347 -3 



6346 -2 



10 











6141 -9 



6140-6 



15 











6122 -43 



6121 -43 



5 











6065 -7 



6064-5 



5 











5991 '6 



5990 -0 



15 











5875 -9 



5874 -9 



100 



5876 -0 



5876 -0 



5876 -0 



5876 -0 



5429-9 



5428 '8 



8 











5404 -1 



5403 -1 



5 











5048 -2 



5047-8 



2 









5047 -1 



5015 '8 



5015-0 



30 



5016 -0(4) 





5016-0(1) 



5015 -9 



4922 -3 



4921 -3 



30 



4922-0(4) 



4924(3) 



4922 -0(2) 



4922 -6 



4713 -4 



4712 -5 



2 



4713 -2(5) 



4716(2) 



4715-0(3) 



4713 -4 



4471-8 



4471 -2 



100 



4471 -8(10) 



4472(4) 



4472-0(6) 



4471 -5 



4389 -5 



4388-5 



1 



4390 -0(1) 



4390(2) 



4389 -0(5) 



4386 -3 



4026 -5 



4025 -9 



§ 



4026-0(6) 



4026(3) 



4026 -0(6) 



4026-1 



3964 -0 



3963-5 





3963 -8 





3964 -0(3) 



3964-8 



3888 -7 



3888 -0 





probable^ 





probable 



3888-5 



* ' Phil. Trans./ 1895, vol. 186, A, p. 76. 

 f < Phil. Trans.,' 1893, vol. 184, A, p. 695. 



X This line is too close to a hydrogen line to enable a definite statement to be 

 made. 



§ Professor Young has recently called attention to the fact that although this 

 line was not included in his chromospheric list, he observed and published it in 

 1883; its frequency is about 15. ('Nature,' vol. 52, p. 458.) 



