456 Proceedings of Royal Society of Edinburgh. [sess. 
3. Potassium sulphate. 
J mol. K 2 S0 4 
, H-Jmol. KOH; 
^ mol. K 2 S0 4 + f-Q 
mol. Cr 2 (S0 4 ) 3 . 
I. 
II. 
III. 
IV. 
A 
•002101 
•001041 
49-5 
2325 
869 
37*4* 
1940 
1000 
51*5 
B 
2174 
1217 
56-0 
C 
1604 
845 
52-6 
1595 
770 
48*3 
1721 
802 
46*6 
Mean 
50-8 
4. Sodium sulphate. 
mol. Na 2 S0 4 
+ i mol. NaOH ; | mol. Na 2 S0 4 + mol. Cr 2 (S0 4 ) 3 . 
I. 
II. 
III. 
IV. 
A 
*001700 
•000628 
36-9 
1738 
831 
47*6* 
1827 
708 
38*8 
1857 
869 
46-8* 
B 
1906 
654 
343 
1900 
667 
351 
1857 
858 
46-3* 
C 
1327 
591 
44-5* 
1344 
524 
39*0 
1331 
640 
48T* 
Mean 
36*8 
(Mean of *, 46*7.) 
Before proceeding to the discussion of these results, we may 
briefly describe certain isolated experiments which have been 
made. 
A. Temperature Coefficient. 
The unsymmetrical cell, already referred to, was set up with 
solutions containing J mol. (NH 4 ) 2 S0 4 + \ mol. NH 3 , and 
i mol. (NH 4 ) 2 S0 4 + * mol. Cr 2 (S0 4 ) 8 . 
