MR. G. A. SCHOTT ON THE REFLECTION AND REFRACTION OF LIGHT. 867 
Essence of Lavender—Air (31, p. 173). 
/X = 1-462 ; A = + -00387, B = -000027, F = - -00096, E = + -00670 ; 
e = + -00150. 
/L 
observed. 
calciilated. 
Differ¬ 
ence. 
Differ¬ 
ence 
Cauchy. 
X 
~ 2 
observed. 
r 
cal¬ 
culated. 
Differ¬ 
ence. 
Differ¬ 
ence . 
Cauchy. 
0 
1 56 
82 
0 
16 
/ 
0 
O 
1 
26 
0 
1 
24 
+ 
/ 
2 
+ 
/ 
2 
•967 
•962 
+ ^005 
•004 
56 
20 
13 
0 
1 
9 
1 
5 
+ 
4 
+ 
2 
•944 
•952 
- -008 
— 
•019 
56 
14 
10 
20 
0 
55 
0 
56 
— 
1 
— 
O 
O 
•941 
•944 
- -003 
— 
•017 
56 
8 
8 
40 
0 
46 
0 
46 
0 
— 
2 
•932 
•933 
- •OOl 
•017 
56 
2 
6 
15 
0 
33 
0 
37 
— 
4 
— 
6 
•917 
•918 
- -001 
— 
•021 
55 
56 
4 
45 
0 
25 
0 
28 
3 
— 
5 
•922 
•893 
+ -029 
± 
•004 
55 
50 
4 
20 
0 
23 
0 
19 
+ 
4 
+ 
2 
•899 
•848 
+ -051 
•oil 
55 
44 
1 
58 
0 
10 
0 
11 
— 
1 
0 
•758 
•752 
-F -006 
— 
•038 
55 
38 
1 
18 
0 
7 
0 
6 
+ 
1 
_ 
1 
•501 
•528 
- -027 
— 
•021 
55 
32 
1 
40 
0 
9 
0 
12 
— 
3 
— 
3 
•282 
•278 
+ -004 
•058 
55 
26 
4 
20 
0 
23 
0 
21 
+ 
2 
+ 
4 
•187 
•164 
-F -023 
± 
•064 
55 
20 
5 
30 
0 
29 
0 
30 
— 
1 
0 
•136 
115 
+ -021 
± 
•049 
55 
14 
6 
22 
0 
34 
0 
39 
— 
5 
— 
5 
•103 
•086 
+ -017 
± 
•022 
55 
8 
8 
50 
0 
47 
0 
49 
— 
2 
0 
•081 
•069 
+ -012 
+ 
•030 
55 
2 
10 
20 
0 
55 
0 
58 
— 
3 
— 
1 
•046 
•057 
- -Oil 
+ 
•004 
54 
56 
13 
10 
1 
10 
1 
8 
+ 
2 
+ 
4 
•046 
•048 
- -002 
+ 
•010 
54 
50 
14 
30 
1 
18 
1 
16 
+ 
2 
+ 
3 
•042 
•042 
•000 
+ 
•010 
54 
44 
16 
50 
1 
31 
1 
27 
-1- 
4 
+ 
4 
•034 
•038 
- -004 
F 
•005 
54 
38 
18 
0 
1 
38 
1 
36 
+ 
0 
4- 
3 
•030 
•034 
- -004 
+ 
•005 
Probable error . 
± 1-60 
=t: 1 
•67 
±•0102 
±•0160 
5 s 2 
