298 ON THE CALCULATION OF THE CONDUCTIVITY OF 
Results of Observations on Simple Solutions. 
For the purposes of calculation it was necessary to draw 
curves for each salt, showing the relation of dilution to ionic 
concentration. It was therefore necessary to know the concen- 
trations and conductivities of a sufficiently extended series of 
dilutions of each salt. The following table gives the dilution, 
conductivity, and concentration of ions of each solution 
examined. 
POTASSIUM SULPHATE. | SODIUM SULPHATE. 
Dilution. | orig bat done eae elie” | cok ana 
20.00 959 .03875 | 20.00 784 0370 
15.62 934 .0167 |) 15.62 771 0466 
12.50 918 0574 —||:12.50 753 0568 
10.00 | 898 0702 10.00 734 0692 
8.605 | 893 S11 | 7.047 | 663 0888 
7.173 79 0957 | 5.882 | 651 1044 
| 5.973 | 856 1119 «|| 5.313 | 648 1150 
| 4.977 | 839 1316 || 3.692 | 623 1592 
3.456 | 791 1787 «||: 2.918 | 598 1933 
2.880 | 771 209 2.431 | 588 226 
2.400 | 753 245 2.022 | 562 262 
2.073 | 741 279 1.689 | 541 302 
2.000 | 737 288 1.408 | 521 319 
1.440 | 707 384 1.176 | 496 397 
1.200 | 689 449 1.016 | 478 443 
1.000 | 672 525 317 | 456 507 
The dilutions are expressed in terms of litres per equivalent 
gramme-molecule at 18°C. The conductivities are specific mole- 
