290 
Proceedings of Royal Society of Edinburgh. [sess. 
The following are the tables : — 
Constants and Coefficients. 
Concen- 
tration. 
| a x 10 6 
b x 10 8 
c x 10 9 
«15 X 10 5 
a 20 X 10 5 
a 26 x 10 5 
I 
«30 X 10 5 
Sodium Hydrate. 
16-3329 
+ 430 
+ 000 
+ 116 
42 
44 
47 
51 
6-0785 
+ 310 
+ 890 
-327 
31 
37 
38 
36 
3-1305 
+ 300 
+ 124 
- 21 
30 
31 
32 
33 
Barium Hydrate. 
•8939 
+ 97 
+ 1200 
-180 
10 
20 
29 
34 
•0821 
+ 130 
+ 980 
-210 
13 
21 
26 
28 
•0430 
+ 143 
+ 630 
- 28 
14 
20 
27 
31 
Strontium Hydrate. 
•3274 
+ 180 
+ 340 
+ 50 
18 
21 
27 
31 
•1216 
+ 220 
-410 
+ 380 
22 
21 
26 
35 
•0235 
+ 165 
+ 600 
- 12 
16 
22 
29 
33 
The expansion coefficients, since they involve small differences 
of volume, are subject to large errors in the fifth decimal place, 
and can only be considered as approximate. 
The following curves show expansion coefficient plotted against 
Sodium Hydroxide. 
Fig. 3. 
concentration, the first set being for sodium hydroxide alone, while 
the second set are for the three hydroxides. In the second set 
