48 Mr. W. R Bousfield and Dr. T. M. Lowry. [June 19. 



f 



7] (OOS.). 



i] (calc.) 

 (Thorpe and Eoc 



Diff. 

 ger.) 



17 (calc.) Diff'. 

 (Bousfield and Lowry.) 



5 '45 



'01494 



-01494 







-01494 



13 -52 



-01181 



0-01179 



9 



-01181 



22 -02 



-00955 



-00951 





0-00954 -1 



30 72 



00 /S6 



"00784 





* 00786 



39 -32 



-00662 



"00661 







-00662 



-47-03 



-00576 



-00577 



+ 1 



-00576 



55 "53 



'00501 



-00502 



rl 



0-00500 -1 



The values of a and /8 in this formula for the viscosity of water are 

 considerably larger than those which express the influence of tem- 

 perature on the conductivity of the majority of aqueous solutions, but 



agree remarkably closely vsith the values given by Kohlrausch for (lie con- 

 ductivity of purified water; this he found to have an abnormally large 

 temperature coefficient, the constants being 



a = + 0-0254, = + 0-000130, 



as compared with, the values of the constants in the viscosity formula 



a = 4- 0-0251. ft = + 0-000115. 



The striking agreement between the constants in the two equations 

 shows that not only do the conductivity and viscosity of water tend 

 towards the same limiting temperature, but also that their variation 

 with temperature can be expressed by one formula and represented 

 by one curve : between 2° and 22° the maximum divergence between 

 the values calculated from the two formula? is only 0-2 per cent. 



The conductivity zero for water at - 39" is not an isolated pheno- 

 menon, and although the data available are in no case so numerous or 

 so accurate as in the case of water, it is possible to make at least an 

 approximate determination of the position of the conductivity zero for 

 a number of other solvents. For this purpose three different methods 

 are available. 



(1.) The influence of temperature oti viscosity has been determined 

 with great care by Thorpe and Eodger for a large number of liquids, 

 several of which are capable of acting as ionising solvents. In the 

 case of these solvents the conductivity zero should lie at temperatures 

 not far removed from the limits of fluidity deduced from the viscosity 

 formulae. In this way an approximate determination can be made of 

 the conductivity zero of the following solvents : — 



Acetone - 210° C. 



Ethyl ether -136 



Methyl alcohol -164 



Ethyl alcohol -210 



