l-2'2 Spectra of the Flames of Metallic Compounds. [June 10, 



Table of Wave-lengths of Nickel Lines photographed from the 



Flame. 



2943-5 

 2981-2 

 2983-6 

 2992-2 

 2994-1 

 3002-1 

 3003-2 

 3011-5 

 3018-8 

 3031-4 

 3037-5 

 3044-5 

 3050-4 

 3053-9 

 3057-2 

 3064-2 

 *3080-3 ? 

 3096-6 

 3098-6 

 3101-1 

 3101- 

 3105-0 

 3113-7 

 3133-6 

 3145-5 



L-ll 

 L-4J 



3183-8 

 3194-9 

 3196-6 

 3201-5 

 3221-1 

 3224-6 

 3226-3 

 3232-6 

 3234-2 

 3242-6 

 3247-8 

 3250-1 

 3270-6 

 3282-2 

 3285-0 

 3315-1 

 3319-7 

 3321-6 

 3361-0 

 3365-5 

 3367-2 

 3368-9 

 3371-3 

 3373-6 

 3380-0 



3390-4 

 3392-4 

 3409-0 

 3413-4 

 3413-8 

 3423-1 

 3433-0 

 3436-7 

 3445-7 

 3452-3 

 3457-8 

 3461-1 

 3466-8 

 3468-9 

 3470-8 

 3483-1 

 3485-2 

 3492-3 

 3500-0 

 3509-7 

 3514-4 

 3519-1 

 3523-9 

 3527-1 

 3547-5 



3561-1 

 3565-7 

 3571-2 

 3587-2 

 3601-4 

 3609-8 

 3612-1 

 3618-8 

 3624-1 

 3663-4 

 3669-7 

 3673-4 

 3687-6 

 3694-6 

 3721-6 

 3736-1 

 3737-0 

 3745-0 

 3775-0 

 3783-0 

 3791-0 

 3806-6 

 3831-7 

 3857-8 

 3972-0 



The more refrangible lines in the foregoing table were very faintly 

 depicted on the photographic plate, and it is possible that a more 

 lengthened exposure than the fifteen minutes, which we employed in 

 the region where the lines were faint, would have brought out more 

 lines. The continuous spectrum of the limelight extends some dis- 

 tance further than the most refrangible of these nickel lines. 



Flame of Zinc Ethide. 



Zinc ethide burning undiluted produces so much continuous spec- 

 tram as to overpower any special rays. But by passing a stream 

 of hydrogen through a bent tube containing zinc ethide, and burning 

 the mixed gas and vapour in oxygen, as we did the nickel-carbonyl, 



* A query is placed against this number because the water spectrum is so strong 

 at this point that we cannot certainly distinguish the nickel line. There is no 

 other reason for doubting its presence. 



