NOYES AND COOLIDGE. — ELECTiUCAL CONDUCTIVITY. 201 



TABLE V. 



thousandth part of the concentration (given in the second column) and 

 by the resistance (given in the third column) after correcting this for 

 the water. 



XII. Summary of the Conductivity Values. 



All of the equivalent conductivity values of Table VI have been 

 brought together in Table VII, after reducing them by means of the 

 temperature-coefficient obtained from our values, to round temperatures. 

 The different solutions always differed slightly from the round concen- 

 trations given in the table, but the difference is too small to affect the 

 equivalent conductivities in the last place given. The first column gives' 

 the date of the experiment ; the second, the equivalent conductivity 

 "Initial " measured at 140° immediately after the measurements at 26° ; 

 and the third, the equivalent conductivity "Final" measured upon re- 

 turning to 140° after making measurements at the higher temperatures. 

 The following columns for the higher temperatures are similar to the 



