1911—12.] Absorption of Light by Inorganic Salts. No. VI. 53 
The molecular extinction coefficient A was determined in the same way 
jas in the second paper of the series for the dilute solutions of the chloride 
land other salts. That is, readings were taken on the nicol of the spectro- 
photometer with a cell containing the solution before the lower slit and a 
jsimilar cell containing water before the upper slit, and readings were again 
taken with the cells interchanged. The value of d ranged from *006 cm. 
in the case of solution I to 2 cm. in the case of solution V. The values of 
A obtained for the various solutions are given below. The concentrations 
of the cobalt chloride and water in grm.-mols. per litre of solution are 
denoted by c x and c 2 respectively. 
Values of A. 
1 
I. 
la. 
16. • 
Ic. 
Id. 
1/ 
L- 
I h. 
A. 
c x = 1*028 
•9766. 
•9252. 
•8738. 
•8224. 
•7790. 
•7196. 
•514. 
•257. 
! 
c 2 = 0. 
3-03. 
5-75. 
935. 
12 ‘22; 
1521. 
20-42. 
29-51. 
42-62. 
434 /ULfJL 
3*33 
3*83 
2-59 
2*22 
1-49 
1-95 
1-70 
1*10 
1-24 
444 
3*27 
4-35 
2-73 
2-85 
2-28 
2-38 
2-15 
1*89 
1-73 
453 
3*28 
4-84 
3-87 
3-74 
3-07 
3-50 
3-21 
2-56 
2-45 
463 
4-18 
4*89 
4-60 
4-81 
4-13 
4-33 
4*21 
3*24 
3-27 
■ 475 
4-99 
5-51 
5-51 
5-74 
4-64 
4*93 
5-05 
3-83 
3-95 
486 
5-12 
6-42 
6-00 
7*64 
5-47 
5-61 
5*32 
4-35 
433 
499 
7*41 
8*12 
7-38 
7-83 
6-67 
6-20 
6*24 
5-26 
5-26 
514 
9*83 
9-35 
9-60 
| 8-57 
7*01 
6*59 
6-63 
5-40 
5-49 
529 
14-2 
10-7 
9-95 
8-48 
6-08 
5-90 
5-64 
4-01 
3-63 
547 
30- 
14-5 
10-7 
7-61 
4-30 
3-91 
3*59 
2-61 
2-13 
563 
44- 
24-2 
15*5 
10-4 
335 
2-77 
2-29 
1-29 
1-20 
582 
87* 
51-6 
37-3 
25-5 
4-64 
2-40 
1-64 
•55 
•51 
602 
125- 
90*6 
64-1 
38-2 
6-71 
2-69 
1-60 
*41 
•43 
625 
182- 
131- 
98- 
52-9 
9-56 
3*47 
1-64 
•44 
•33 
653 
218- 
154* 
113- 
64-7 
11-2 
3-56 
1-98 
•34 
•32 
687 
210* 
175* 
125* 
68 -6 
11*0 
3*92 
1-72 
•29 
•27 
717 
65-5 
641 
40-0 
30-7 
3*26 
1-61 
•58 
•29 
•28 
[Values of A. — II. 
