224 Mr Purvis, The influence of a strong magnetic field on the 
refracted edge of a wide reversed band and therefore hidden from 
view. This strong line has not been described before. It is 
divided into three, and the reversed band is widened, but whether 
the latter divided into more than three constituents was not 
very clear, because the images impinged upon the three stronger 
constituents of the sharp line : but the most refracted weak line, 
vibrating perpendicular, and belonging to the reversed band, 
showed signs of division. The other constituents of the band could 
not be made out as they were not clear of the three constituents 
of the line. 
Gold. 
The following lines were divided into four; the latter could 
only be seen well separated on analysis by the calcite. The 
measurements were between corresponding constituents. 
x 
Inten- 
sity 
d\j X 2 
3029-31 
+ 2-15 s 
+ 0-99p 
3 0 
- 0-99 p 
-2-15 s 
The four constituents were equally sharp and strong ; 
and the general appearance is comparable with Pb 
3740-1, 2873-41 (p. 219) and Sb 3722-93, 3638-01 
(p. 221). 
2676-10 
1 r. 
+ 1-95 s 
+ 1-06 p 
0 
- 1-06 p 
- 1-95 s 
The four constituents were more diffuse than those of 
3029-31. 
The following lines were divided into three ; the middle con- 
stituent of each triplet was stronger than the two outside. 
4792-79 
3 r. 
+ 1-77 s 
0 p 
-1-83 s 
4065-25 
1 
+ 1-15 s 
0 p 
-1-15 s 
3898-00 
1 r. 
+ 2-17 s 
0 p 
-2-12 s 
3804-20 
5 
+ 2-18 s 
0 p 
-2-21 s 
3586-84 
3 b. 
+ 1-62 s 
0 p 
-1-62 s 
The middle constituent was removed by calcite. 
Compare X 2913-68, Bi 4121, Sb 3029. 
Compare X 2748. 
The line 3586-84 is diffuse on the more refrangible edge. 
The middle constituent was removed by calcite. 
