140 Proceedings of the Royal Society of Victoria. 



the diffl^rent values of tlie conductivity and concentration ; 

 as before, the curve showing the mean calcuhited vaUies, and 

 the crosses the observed vakies. 



The following table gives the conductivities for several 

 concentrations and temperatures, and may be useful for 

 reference : — 



DESCRIPTION OF PLATES XV AND XVI. 



cups ; c c, indiarubber 

 e e, Liebig condensers ; 



Fig. ]. — a, glass tube; b 6, copper 

 blocks; r?, h«^iiip Packing 

 /, level of solution in cell ; (/, level of bath in 

 which cell is immersed. 



Fig. 2. — Curves I, II, III, showing agreement between 

 mean value of temperature coefficients, and 

 values in typical cases. Abscissae represent tem- 

 perature centigrade ; ordinates, conductivity. 



Fig. 3. — Curve IV, showing that the connection between the 

 logarithms of tlie concentration and conductivity 

 is linear, and consequently, that the conductivity 

 varies as a power of the concentration. Abscissae, 

 logarithms of conductivity; ordinates, logarithms 

 of concentration. 



