on Spectrum Analysis. 103 



spectrum was the brightest. The observations made with the 

 large spectroscope are noted. The intensity, estimated for the 

 spectrum as seen in the small spectroscope, is given on a scale 

 from 1 to 5. The minus sign after a number indicates that the 

 intensity falls short of that number, and the plus sign that it 

 exceeds it ; so that 1 + means an intensity between 1 and 2 

 but nearer 1 than 2, whilst 2 — means intensity nearer 2 

 than 1. 



No. 



Wave-length. 



Intensity. 



Eemarks. 



1. 



0,0006778 



1- 





2. 



6680 



1 



Nos. 2-17 observed in the large 



3. 



6600 



1 + 



spectroscope ; Nos. 2-10 with a 



4. 



6527 



1 



wider slit. 



5. 



6445 



1 



- 



6. 



6373 



1 





7. 



6294 



1 





8. 



6229 



1- 





9. 



6164 



1- 





10. 



6111 



1- 





11. 



6052 



2- 



Breadth 31 X 10" 7 . 



12. 



5996 



1+ 



„ 38. 



13. 



5934 



1 



36. 



14. 



5881 



1- 



33. 



15. 



5833 



1- 



33 (double?). 



16. 



5784 



1- 



30 (double?). 



17. 



5734 



1 





18. 



5665 



1-- 



Very weak. 



19. 



5621 



1- 



C Sharp edge of a band, beginning 

 •j about 557°, very weak, and gra- 



20. 



5382 











dually becoruiug stronger. 



21. 



5304 



1-- 



Very weak. 



22. 



5228 



2- 



I In the large spectroscope four 



23. 



5164 



1 + 



1 lines : 5224, 5195, 5179, 5145. 



24. 



f 5067 1 

 { 4996 } 



2 



("In the large spectroscope 5060, 

 1 5029, 4983. 



25. 



4910 



2 





26. 



4813 



2 



In the large spectroscope 4832, 4812. 



27. 



4700 



3+ 



4715, 4707. 



28. 



4659 



2+ 



4663, 4647. 



29. 



4574 



3 





30. 



4491 



2+ 



In the large spectroscope 4500, 4488. 



31. 



4415 



1 





32. 



4341 



3 





33. 



f 4293 1 



[ 4275/ 

 4209 



5 



In the large spectroscope 4278, 4269. 



34. 



1 





35. 



4152 



1 



In the large spectroscope 4140. 



36. 



4074 



2+ 



4057. 



37. 



4020 



2- 



3995. 



38. 



3910 



x - 



Broad band. 



The spectrum underwent no change if the connexions of 

 the coatino;s with the conductors were reversed. I have 



