544 Proceedings of the Royal Society of Edinburgh. [Sess. 
Values of A for more Concentrated 
Solutions. Infra-Red. 
A 
d= 1 mm. 
c = 4-09. 
Chloride. 
c = 3-19. 
Bromide. 
'684/* 
2*29 
2-20 
•720 
2-58 
2-38 
•750 
1-68 
1-32 
•794 
1*01 
•73 
•850 
•45 
•40 
•910 
•39 
•51 
•980 
•89 
1-02 
1-07 
1-70 
2-07 
1-17 
2*46 
2-53 
1-27 
2*03 
2-03 
1-38 
1-33 
1T1 
Increase in A produced by Heating. 
A 
d — 1 
mm. 
c = 4-09. 
Chloride. 
c -3T9. 
Bromide. 
•717/* 
17 
•24 
•602 
-•07 
•07 
•529 
4- -00 
•14 
•475 
•49 
•35 
•434 
2-00 
1-32 
•684/* 
•21 ? 
•49? 
•794 
•81 
•32 
•980 
-•02 
-•04 
1-270 
1 
-j- *28 
+ •40 
The concentrations used above are near saturation. An almost satur- 
ated solution of the sulphate was prepared, for which c was equal to 2 TO, 
but when it was examined with the spectrophotometer no change in A 
could be detected. 
