Porttok & Lronarp—On the Spectra of Iron, &c. 225 
Zinc. (Plate XV.) 
Spectra 4, 5,6, and 7 show the metal and three solutions. Zine 
has a strong line coincident with gold line No. 16, and another 
with the gold line just beyond No. 20. As in the case of 
aluminium, quite a number of lines develop strongly with the 
metal and strong solutions, but not with dilute solutions ; these 
are marked o in the following table :— 
QUANTITATIVE SpecrRUM oF Zinc CHLORIDE. 
Intensity Intensity 
Wave-length. and Wavye-length. and 
Persistency. Persistency. 
8 3035-9 8o 
4810°7 10 1= 
9 3018°5 do 
4722°3 106 ||—— 19-20 -—— 
4680°4 109 | 2801-0 8o 
—— 10-15 | 2771-0 8 
304373 10x | 2756°5 6 
3303°0 10x —2]- 
3282°4 10x 2712°6 20 
2684°3 20 
22-24 -—— 
mae 2582°6 2o 
307670 8a 2570-0 2a 
3072°2 10¢ | 2558-0 10x 
SCIENT. PROC. R.D.S., VOL. XI., NO. XVII. 2F 
