ON ELECTROLYSIS AND ELECTRO-CHEMISTRY. 147 



given have been deduced from Gerlach's tables in the ' Zeifcschrift fiir 

 analytische Chemie,* vol. viii. p. 243, &c. 



IV. The temperatures at which the solutions have the specific 

 gravities given in the previous column for the given strength of solution. 



V. The conductivity, as expressed by the observer. In the cases iu 

 which the observer has expressed his results for specific molecular con- 

 ductivity no numbers are given in this column. 



VI. The temperature at which the conductivities of the solutions have 

 been determined. 



VII. The temperature coefficient referred to the conductivity at 18° 



i.e. 1 f^iO- 

 k^^\ ct J 



VIII. The specific molecular conductivity of the solutions at 18° in 

 terms of the conductivity of mercury at 0° ; specific molecular conduc- 

 tivity is the ratio of the conductivity of a column of the liqaid 1 centimetre 

 long and 1 square centimetre in section to the number of gramme 

 equivalents per litre. 



In some few cases in which no temperature coefficients have been 

 determined the results have been given for the temperature at which 

 the observations were made. 



The numbers given in the column are the values for the specific 

 molecular conductivity x 10^. 



IX. This column contains the values for specific molecular conduc- 

 tivity at 18° in C.G.S. units : they are obtained from those in the previous 

 column by being multiplied by the value of the conductivity of mercury 

 at 0° in C.G.S. units. This factor is 1-063 X IQ-^. 



X. The migration constant for the anion ; for instance, in the case of 

 copper sulphate (CUSO4) for (SO4). 



XI. The temperatures at which the migration constants have been 

 determined. 



XII. The number of gramme molecules per litre, as defined for 

 column II., for which the fluidity data are given in the following columns. 



XIII. The fluidity of the solutions of the strength given in the 

 previous column. 



Most of the results given for the fluidity of solutions are expressed in 

 terms of the fluidity of water at the same temperature : to obtain the 

 absolute values for the solutions they have been multiplied by the 

 value for the fluidity of water at the given temperature. The values used 

 for this purpose have been taken from Sprnng's observations for the 

 viscosity of water given in ' Poggendorfi^s Annalen,' vol. clix. p. I. 



To obtain the values for fluidity in C.G.S. units the numbers in this 

 column must be multiplied by the factor '1019. 



XIV. The temperature at vrhich the solutions have the fluidity 

 given in the previous column. 



XV. The temperature coefficient of fluidity at 18°, that is, - ( s *)• 



XVI. In the last column are given the references to the various papers 

 from which the data are taken : against each reference will be found a 

 number, which appears also against the first of the data which have been 

 taken from the paper in question. 



I. 2 



