DR. GLADSTONE ON THE REFRACTION-EQUIVALENTS OE THE ELEMENTS. 15 
Table V. — Refraction-equivalents of Compounds in Solution. 
Substance. 
Atomic 
weight. 
Monobasic. 
Bibasic. 
Chloride. 
Bromide. 
Iodide. 
Nitrate. 
For- 
miate. 
Acetate. 
Cyanide. 
Sulphate. 
Hyposul- 
phite. 
Lactate. 
Univalent. 
Potassium 
391 
18-83 
25-09 
35-72 
2211 
20-24 
27-78 
17-23 
3311 
47'88 
76-25 
Sodium 
23 
15-40 
21-89 
32-52 
18-89 
24-34 
26-92 
41-80 
69-45 
Lithium 
7 
14-86 
20-56 
31-49 
23-25 
24-26 
Caesium 
133 
24-4 
Rubidium 
So -4 
24-28 
T 
45-95* 
Silver 
108 
27-44 
25-52* 
66-3* 
Thallium 
204 
37-2 
C/D 
CO 
CS1 
CO 
40-45 
Ammonium 
18 
22-33 
28-53 
38-90 
25-44 
31-57 
39-22 
1 
14-22 
20-65 
3117 
16-50 
13-81 
21-29 
22-45 
Bivalent. 
137 
37-32 
50-72 
69-72 
43-26 
39-82 
56-44 
78-98 
35 04 - 
47-52 
41-68 
3904 
78-2 
40 
32-28 
44-32 
64 66 
38-66 
33-94 
49-80 
42-52 
Magnesium 
24 
28-88 
35-92 
30-80 
4602 
24-18 
38-52 
92 
35-08 
96 
3418 
65-2 
30-76 
43-96 
65-67 
38-52 
34-95 
48-80 
26-2* 
27-61. 
112 
35-32 
47-88 
41-38 
30-34 
63-4 
33-40 
40-04 
27 80 
56 
32-86 
46-26 
29-09 
58-8 
31-39* 
38-30 
2816 
58-8 
32-02 
38-48 
5006 
2901 
55 
33-58 
47-24 
65-14 
40-22 
51-34 
27-83 
73-8 
207 
52-56 
64-52 
200 
41-23 
48-80* 
34-16 
1065 
43-90* 
Trivalent. 
Aluminium 
27-4 
40-5* 
67-7 

Iron 
56 
51-27 
62-20* 
90-9* 
| 
Chromium 
5 - 2-2 
48-2* 
82-46* 
Gold 
196-7 
5611* 
Rhodium 
104-4 
65-08* 
Quadrivalent. 
197-4 
71-06* 
Table Y. — Supplementary. 
Substance. 
Atomic 
weight. 
Monobasic. 
Bibasic. 
Alco- 
holate. 
Hydrate. 
Silicate. 
Hypo- 
phosphite. 
Nitrite. 
Tartrate. 
Chro- 
mate. 
Bichro- 
mate. 
Oxalate. 
Car- 
bonate. 
Univalent. 
Potassium 
39T 
28-10 
12 61 
31-03* 
27-28 
19-31 
57-87 
51-50 
82-55 
37-71 
28-77 
Sodium 
23 
24-61 
9-20 
27-28 
15-50 
50-85 
46-08 
74-87 
22-35 
Lithium 
7 
43-62 
72-60 
Ammonium . . . 
18 
15-42 
58-12 
87-06 
42-22 
Ilvdrogen 
1 
20-857 
5-92632 
45*29 
23-44 
Bivalent. 
Calcium 
40 
46-88 
Manganese 
24 
48-10 
Substance. 
Atomic 
weight. 
Monobasic. 
Bibasic. 
Tribasic. 
Quadribasie. 
Fluoride. 
Arsenite. 
Sulpho- 
cyanide . 
Sulphite. 
Biborate. 
Per- 
manganate. 
Ferri- 
cyanide. 
Ferro- 
cyanide. 
Potassium 
Sodium 
39-1 
23 
955 
26-14* 
33-47 
35-10* 
45-9 
91-8 
10205 
114 72 
