PotitoK & Lronarp—On the Spectra of Iron, Sc. 227 
Nicket. (Plate XVI.) 
Spectra 1, 2, 3, and 4 show that the same lines are developed 
by the metal and strong solutions, as there are practically no 
outstanding short lines in the fourth spectrum, and the first and 
third spectra are identical; the relative rate of disappearance of 
the lines on dilution is shown in the table :— 
QUANTITATIVE SpEcTRUM oF NicKEL CHLORIDE. 
Intensity | Intensity 
Waye-length. and | Wave-length. and 
Persistency. || - Persistency. 
| 
3619°5 10 3134°3 8x 
3597'S 109 he 
eae Ye 
3102-0 8 
3566-5 10¢ 
3101°6 8x 
3524-6 10x 
3064-7 1 
3515°2 10x 
: 3057°7 Sy 
35105 10x 
305474 TW 
3493-1 10x 
3050-9 Sy 
3472°7 8 
| 3038-0 7x 
3446-3 8x 
3433-7 7x tee 
3423-8 79 $0121 8x 
3414°9 sky 3003°7 8x 
3393°1 | 7p ——- 19-23 ——_— : 
Wee 2546-0 76 
3047-7 16 Oe ayer ae 
3233-1 8p 25109 | Sy 
| | 
