284 Transactions of the Boyal Microscopical Society, 
again able to bring before you some really valuable work, performed 
by this new method of measuring the bands in the spectrum. 
Table No. 1. — Valie of the Milled Head Divisions. 
1 
0-005 
6 
0-030 
11 
0-055 
16 
0-080 
2 
0-010 
7 
0-035 
12 
0-0(0 
17 
0-085 
3 
0-015 
8 
0-040 : 
13 
0-065 
18 
0-090 
4 
0-020 
9 
0-045 ' 
14 
0-070 
19 
0-095 
5 
0-025 
10 
0 050 
15 
0-075 
20 
0 100 
