1910-11.] Absorption of Light by Inorganic Salts. No. II. 537 
about 80° C., as against 70° C. in the case of the work in the infra-red. The 
results are given below : — 
Increase in A produced by Heating (A' -A). 
A. 
c = 3-10. 
Chloride. 
c=2-79. 
Bromide. 
c=2*96. 
Iodide. 
c = 3-66. 
Nitrate. 
c = 2*00. 
Sulphate. ! 
434/i/t 
2-68 
•33 
•93 
•04 
453 
1-72 
•43 
-•17 
•40 
475 
2-36 
•90 
+ •50 
•61 
499 
3*63 
1-30 
2-15 
•59 
529 
6*87 
2-58 
2-92 
1-42 
563 
11-8 
2-44 
1 *97 
4-28 
•94 
602 
32-6 
•97 
•74 
1-31 
•18 
653 
389 
1-42 
•42 
•12 
•09 
717 
30*4 
1-69 
•35 
•73 
- 13 
The change is very striking in the case of the chloride, the bromide, 
and the nitrate. For the chloride and bromide the values of A for 
the cold dilute, the cold concentrated and the hot concentrated solutions 
are represented in figs. 4 and 5, the values from the infra-red being added 
from the first paper of the series. In both diagrams the values for the 
cold dilute solution are shown by a light line, the values for the cold con- 
centrated solution by a heavy line, and the values for the hot concentrated 
by a dotted line. 
{Issued separately July 8, 1911.) 
