KAHLEXBERG — THEORY OF ELECTROLYTIC DISSOCIATION. 335 



(Tables 22 to 29) shows that the molecular weight of the sul- 

 phates is less by the former than by the latter method in the 

 case of corresponding concentrations. So that if it be assumed 

 that these sulphate- are polymerized in their solutions, it fol- 

 lows that this polymerization is greater at the boiling-points 

 of the solutions than at their freezing-points, which seems un- 

 likely. 



It was thought to be of interest in this connection to in- 

 vestigate the behavior of a non-electrolyte. Cane sugar was se- 

 lected, the results obtained with which by the boiling-point 

 method are given in table 30. The results indicate clearly that 

 the molecular weight diminishes appreciably as the concentra- 

 tion increases. Strong sugar solutions, however, do not — as is 

 well known — conduct electricity in consequence thereof. The 

 solution was finally tested with Folding's solution to see whether 

 any sugar had become inverted during the process of boiling, 

 but no invert sugar was found. On the other hand a series 

 of boiling-point determinations of solutions of H 3 BO, (Table 

 31) shows that the molecular weight remains practically con- 

 stant for very considerable changes in the concentration of this 

 substance, considering its low molecular weight. The freezing- 

 point of solutions of H3BO3 1 show that the molecular weight 

 is lower at 0° than at 100° ; and its solutions at the lower tem- 

 perature really ought to be somewhat better conductors of elec- 

 tricity (according to the dissociation hypothesis) than they are. 



1 Compare Kahlenberg und Schreiner, Zeit. phys. Chem. 20, 548 (1896). 



