spark spectra of lead, tin, antimony, bismuth, and gold. 223 
X 
Inten- 
sity 
dX/X 2 
3024-79 
2 r. 
+ 1-84 s 
+ 0-67 p 
0 
-0-67 p 
-1-84 s 
The constituents appeared to be equally sharp and 
strong ; but they were so very close and diffuse that 
they were not easy to measure. 
2989-15 
2 r. 
+ 1-99 s 
+ 0-82p 
0 
-0-82p 
-1-99 s 
/The constituents were also very close and diffuse, and 
not easy to measure, although they appeared to be 
equally strong. For this reason the comparison 
with Sb 3722-93 and Sb 3638-01 and Pb 3740-1 and 
Pb 2873-41 is not very exact, although the general 
v appearances were very similar. 
The following lines became triplets : the middle constituent of 
each was stronger than the two outside ones. 
4121-70 
2 r. 
+ 2-22 s 
0 p 
-2-29 s 
3596-36 
1 r. 
+ 1-48 s 
0 p 
-1-48 s 
3397-42 
1 r. 
+ 1-30 s 
0 p 
- 1-27 s 
2993-45 
2 
+ 1-62 s 
0 p 
-1-61 s 
2938-41 
1 r. 
+ 1-83 s 
0 p 
- 1-86 s 
2898-08 
1 r. 
+ 1-74 s 
0 p 
-1-78 s 
The line 
30671 
The middle constituent was removed by calcite. 
The three constituents were very diffuse. 
Both these lines were very similar in appearance, and 
their components were also very similar in their 
diffuseness and intensities. Compare Sb 3231-60. 
well marked reversal. In the magnetic field there were (1) three 
well marked constituents ; (2) a weak one impinging on the least 
refracted edge of the least refracted constituent of these three ; 
and (3) a diffuse weak one on the most refracted side of the 
most refrangible constituent of (1), but not so close as (2). On 
analysis by the calcite, there were three lines vibrating perpen- 
dicular, and two parallel to the lines of force, and the two most 
refrangible of these five were weaker and more diffuse than the 
three less refrangible. The explanation appears to be that there 
was a sharp strong line impinging on the edge of the inside least 
