62 ON THE CONDUCTIVITY, SPECIFIC GRAVITY AND 
In what follows I endeavor to ascertain whether or not the 
above formula is applicable to the specific gravity and surfaee 
tension of simple solutions of KCI and K,SO, and whether or 
not it is possible to predict the values of these properties for 
mixtures of such solutions. 
The observations of specific gravity requisite for this purpose. 
were made by the writer in the way described above. 
On surface tension Rother’s observations were used. They 
were made at 15°C and his values are therefore not strictly 
comparable with calculated values based on ionization coefficients. 
for 18°C. I have, however, reduced a few of the ionization co- 
efficients of the salts to 15°C, by using 7temperature coefficients, 
and found that the difference between the values for the two 
ditferent temperatures is not sufficient to cause any appreciable 
error in my calculated results. Rother’s paper has sufficient 
data for determining the concentration in gramme-equivalents. 
per litre, with atomic weights as used in Table I. Rother 
regards his observations as possibly in error by +5 to +8 in 
the third place of decimals. The surface tension of the water 
he used was 7.357. 
The following table, VI, contains the ionization coefficients 
for simple solutions, used in the calculations. They were 
obtained either from direct observations on the conductivity of 
the solution or by interpolation of the results of Tables I—ILII. 
The concentrations are expressed in gramme-equivalents per litre. 
at 18°C. 
1Kohl. u. Holb., loc. cit., pp 195-199, Table 7. 
