dechiotion is obtainahle; hut the following facts are observable! 
a. Mydrates easily form .supersaturated solution. 
b. Supersatüration is comuion in easily soluble subslances. 
c. Also the phenomenon is cornmon in those substances, which 
easily form big well-defined crystals. 
Physico-chemica l Laboratory, Presidency College, Calcutta. 
Chemistry. — ‘ ‘ Temper ature-coe fficient of conductivity in alcohoUc 
Solutions, and extension of Kohlrausch’s hypothesis to alcoholic 
Solutions.” By Devendra Nath Bhattacharyya and Nilratan 
Dhar. 
(Aangeboden door de Heeren Ernst Eohen en F. M. Jaeger.) 
In a former paper '), the resnlts of conductivity measurements 
of ten sodium salts in alcoholic Solutions were published. The mea- 
sureinents were carried out at three teraperatures, and in this paper 
the values of the tem peratu re coëfficiënt of conductivity are calculated 
and some deductions made from the results. 
If we suppose that the conductivity increases proportionally witli 
the temperature, i. e. the conductivity is a linear function of the 
temperature, we find the following values for the temperature coëffi- 
ciënt of conductivity of the ten sodium salts in alcoholic Solutions 
inVestigated : 
Salt 
Temperature- 
coefficient 
between 0° and 
5 3 C 
Temperature- 
coefficient 
; between 0° and 
30° C. 
Dilution 
I. NaC10 3 
0.018 
0.027 
1774.332 
II. NaCl 
0.016 
0.026 
1623.888 
III. NaN0 3 
0.019 
0.026 
1180.694 
IV. NaNCC 
0.024 
0.027 
1916.937 
V. NaCNS 
0.022 
0.028 
2208.451 
VI. Na,PtCl 6 
0.015 
0.020 
4236.345 
VII. Sodium propionate 
0.023 
0.024 
993.517 
VIII. Sodium butyrate 
0.027 
6.025 
1320.672 
IX. Sodium benzoate 
0.015 
0.024 
685.179 
X. Sodium Salicylate 
0.013 
0.023 
1306.449 
!) Zeitschr. für anorg. Chemie 82, 357 (1913). 
