spark spectra of lead, tin, antimony, bismuth, and gold. 219 
Lead. 
The following lines were divided into four components, but the 
latter could only be seen well separated on analysis by the calcite. 
The measurements were between corresponding components. 
X 
Inten- 
sity 
dX/X 2 
37401 
1 n. 
+ 2-00 s 
+ 0-9 5p 
0 
-0-95 p 
-2-00 s 
The four constituents were equally sharp and strong, 
1 and comparable with those of 2873-41. Also compare 
Sb 3722-93 and Sb 3638-01 (p. 221). 
2873-41 
1 
+ 2'05 s 
+ 0-97 p 
0 
-0-97p 
-2-05 s 
1 The four constituents were equally sharp and strong, 
f and comparable with those of 3740-1. 
The following lines were divided into three ; the middle con- 
stituent of each triplet was the strongest, but the exceptions are 
noted. The measurements were from the centre of the middle 
constituent. 
4387-0 
4245-2 
1 n. 
1 r. 
+ 1-15 s 
0 p 
- 1-15 s 
+ 1-31 s 
0 p 
-1-31 s 
The unaffected lines were strong and nebulous on their 
less refrangible edges and sharper on the more re- 
_ frangible. The general appearances of the unaffected 
f lines and of the constituents were very similar. The 
! constituents were all very diffuse, and it was not easy 
) to strike their centres of gravity in the measurements. 
4062-30 
3 
+ 2-12 s 
0 p 
-2-13 s 
4058-05 
1 r. n. 
+ 1-81 s 
0 p 
- 1-77 s 
The middle constituent was a shade weaker than the 
two outside ones. 
3683-6 
1 r. 
+ 2-15 s 
0 p 
-2-16 s 
| do. 
3671-71 
2 n. 
+ 1-72 s 
0 p 
-1-83 s 
3639-72 
1 r. n. 
+ 2-07 s 
0 p 
-2-04 s 
| The two outside constituents were only a shade weaker 
| than the middle one. They appear to be comparable 
) with those of Sn 3175, 3033, 3009 (p. 220). 
15—2 
