142 
Proceedings of the Royal Society of Edinburgh. [Sess. 
purplish in thick layers. Both solutions were extremely hygroscopic. The 
curves in the case of the last two salts are very similar for both solvents. 
The acetone, except that used in the case of nickel bromide and 
copper bromide, was obtained from Kahlbaum as derived from the sodium 
bisulphite compound. 
The results are given below and the curves in figs. 1 and 2. It will be 
noticed that the vertical scale is different in almost every case : — 
A. 
CuCl 2 , 
Ale. 
c = -43 
last two i|- 
strength. 
1 
CuCl 2 , 
Acet. 
c= *0284. 
CuBr 2 , 
Ale. 
c = ‘013 
last ^ 
strength. 
CuBr 2 , 
Acet. 
c = -032. 
Cu(N 0 3 ) 2 , 
Ale. 
c = -033. 
NiCl 2 , 
Ale. 
c = *100. 
NiBr 2 , 
Ale. 
c = -18. 
NiBr 2 , 
Acet. 
c = * 0163. 
667 i ifj. 
7-90 
19*2 
23-2 
132 
18-6 
2-49 
2-75 
42-4 
647 
7’22 
16-7 
22-8 
146 
14-1 
1*82 
2*29 
46-6 
628 
4-84 
11-8 
21-3 
95-2 
8*90 
1-24 
1-61 
42-7 
609 
2-93 
8-4 
28-3 
50 5 
5-08 
•76 
1-04 
32-9 
590 
1-61 
5-6 
37-0 
28-4 
2*72 
•41 
•57 
20-4 
570 
•98 
5‘3 
51-6 
25-9 
1-66 
•29 
•33 
10-1 
550 
•81 
7-0 
69-3 
31*7 
•50 
•17 
•18 
6-16 
530 
1-40 
19*7 
91-9 
39-7 
•12 
•19 
5-55 
510 
2-89 
57-2 
125 
59 4 
•07 
•40 
"•29 
4-84 
490 
5-79 
155 
170 
72-6 
•27 
•77 
•30 
11-9 
471 
137 
196 
431 
169 
•53 
1-82 
95 
19-5 
452 
18-3 
126 
647 
257 
•25 
4-08 
231 
18-1 
432 
24*0 
116 
794 
280 
•43 
4-04 
A. 
Ni(N0 3 ) 2 , 
Ale. 
c = *094. 
Ni(N0 3 ) 2 , 
Acet. 
c = -033. 
Go(N 0 3 ) 2 , 
Ale. 
c = -041. 
Co(N 0 3 ) 2 , 
Acet. 
c— *029. 
CoCl 2 , 
Ale. 
c = -0712. 
CoCl 2 , 
Acet. 
c = ‘029. 
CoBr 2 , 
Ale. 
c = *031. 
CoBr 2 , 
Acet? 
c = -0179. 
I 
667 m 
4-61 
6*49 
118 
4*31 
131 
254 
151 
647 
4-22 
6-44 
1-22 
3-84 
129 
226 
146 
325 
628 
2-74 
3-92 
113 
377 
112 
190 
142 
274 
609 
1-09 
3-12 
1-88 
8*50 
95*2 
146 
106 
205 
590 
*57. 
1-25 
3-56 
18-4 
763 
116 
80-8 
99'2 
570 
•33 
1-21 
7-60 
330 
460 
70-6 
55-5 
42-4 
550 
•12 
•80 
16-93 
52-4 
26-9 
40-3 
193 
17-2 
530 
•002 
•53 
25 3 
61-4 
14-3 
18-2 
13-9 
11-5 
510 
•001 
•58 
25-2 
54-8 
9-83 
7-5 
11-0 
; 8-9 
490 
•72 
1-37 
21-0 
42-3 
7*01 
4-10 
7-89 
73 
471 
1*42 
2-52 
17-8 
30-7 
4*92 
3-40 
5-53 
7 5 
452 
4-04 
6-88 
10-3 
15*5 
3-58 
2-13 
2-99 
5-9 
432 
6-77 
11*4 
7-39 
9-41 
3-36 
2-11 
257 
6-1 
The values for cobalt chloride in acetone were taken by Mr Cochrane 
with the other spectrophotometer. 
The curves bring out the important facts that when copper, nickel, and 
cobalt salts are dissolved in alcohol or acetone their absorption is much 
greater, and at the same time is much more characteristic of the molecule 
