( 167 ) 
It seems probable to me that, if the experimental methods are 
continually improved, the results will finally be found to agree, as 
the theory requires. 
3. In a treatise, called: “The theory of electrolytic dissociation 
as viewed in the light of facts recently ascertained”, KAHLENBERG !) 
states results obtained in determining the conductivity, the lowering 
of the freezing-point and the raising of the boiling-point of not 
diluted solutions. Here he arrives at the expected result, that in 
most cases the degree of dissociation indicated by the conductivity, 
deviates strongly from that, found when following the two other 
methods. He found i.a. that several salts, which in aqueous solu- 
tion at a certain concentration are not only not dissociated, but 
even somewhat polymerized according to the lowering of the freezing- 
point and the raising of the boiling-point, yet conduct the electric 
current. 
This occurs i.a. with sulphates of Mg, Zn, Cd, Ni, Co, Fe and Cu. 
KAHLENBERG, as well as myself found, that the molecular raising 
of the boiling-point increases with the concentration for NaCl, K Cl 
and also for K Br, Kg, MgCl, and Ba Cls, for the molecular lowering 
of the freezing-point of Na Cl-solutions he found the course already 
mentioned, while Jones, CHAMBER and Frazer?) discovered minima 
for Mg Cl, and Ba Clg in the region of concentration 0,1—0,6. 
The molecular conductivity, on the other hand, increased regularly 
with the dilution. 
I must point out here that KAHLENBERG in his experiments on 
the raising of the boiling-point of Na Cl- and K Cl-solution did not 
find a minimum, though he began with the concentration + 0,2; 
possibly, however, his method, adapted for more concentrated solu- 
tions, was not sensible enough. 
Finally the remarkable fact must be mentioned, that it would follow 
from the raising of the boiling-point of the just mentioned sulphates 
of Mg, Zn, Cd, Ni, Co, Fe and Cu, that the polymerization is 
greater at 100° than at 0° and that minima occur both at 100° and 
at 0°. 
As KanurnperG has already stated, the investigations on non- 
aqueous solutions have brought to light, that though a salt in solution 
shows a normal molecular weight, yet the solution can conduct the 
electric current. This has been proved for solutions of Ag NO, in 
1) Journ. of Phys. Chem. 5. p. 339 (1901). 
*) Amer. Chem. Journ. 23, p, $9, 512 (1900). 
