442 
CAPTAIN ABNEY AND MAJOR-GENERAL EESTING 
that as seen by us. When thus reduced his curve touches the normal about E, and 
after following it a short way leaves it on both sides. On plotting the deficiency 
curves shown in fig. 6, Plate 24, we found that they both started from E. It was 
not until after we had done this that we referred to Clerk Maxwell’s paper, and 
found that according to him the red curve and the blue curve should meet at E. 
We may therefore conclude that the observations made by Pt are trustworthy. It 
will be noticed that the maximum of the red curve lies about scale-number 45'5, and 
that his curve ends at 43’6. 
Its observations. 
Original readings. 
Reduced 
readings. 
Seale reading. 
Intensity. 
Scale reading. 
Intensity. 
56-8 
7 
56-8 
1-5 
56-0 
7-4 
56 
1"75 
55-4 
9-5 
55 
2-0 
54-5 
11-5 
54 
3-0 
53-4 
19-0 
53-5 
3-5 
52-9 
26 
53 
5-0 
52-6 
30 
52-5 
6'75 
52-5 
38 
52-2 
8-2 
52'2 
48-5 
51-8 
10-0 
51-8 
55 
51-6 
11-0 
51-6 
71 
51-4 
13-5 
50-9 
95 
51 
19 
50-6 
122 
50-8 
22 
50-38 
142 
50-6 
25 
50-25 
167 
50'4 
30 
50-1 
199 
50-25 
36 
49-8 
238 
50 
44 
49-4 
290 
49-8 
52 
48-9 
325 
49-6 
59 
48-5 
346 
49-4 
63 
47-8 
367 
49 
69-5 
47-2 
346 
48-9 
71 
46-9 
325 
48-65 
74-5 
46-7 
290 
48 
79 
46-5 
238 
47-5 
77"5 
46-3 
199 
47-2 
74 
4615 
167 
46-9 
68 
46-1 
142 
46-6 
58 
45"9 
122 
46 5 
50 
45-8 
95 
46-3 
43 
45-6 
71 
45"8 
22 
45-4 
55 
45-5 
15 
45-3 
48-5 
45-2 
8-5 
45-0 
30 
45 
5'5 
44-7 
26 
44 
1 
44-5 
19 
43-7 
0 
44-3 
15 
44-1 
7 
