200 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



not SO reliable as the others. They are given here, especially to show- 

 that our conductivity measurements were not afi'ected either by polar- 

 ization or by any uusymmetry in the telephone ; for had this been the 

 case, our cell-constant values calculated from these solutions would not 

 have ao-reed with those derived from the 0.1 normal solutions. 



As explained in Section VIII, the cell-constant cl-.anges with the 

 temperature; the percentage corrections to be applied at the different 

 temperatures of the experiments to the 26° values are given beluvv in 



the table. 



TABLE IV. 



Cell-Constant Corrections. 



The Water Correction. — The conductivity of the water used at the vari- 

 ous temperatures of the experiments was subtracted from the measured 

 conductivity of the solution. Two experiments, the data of which are 

 given in Table V, served as a basis for the correction. For a fuller dis- 

 cussion of this correction, see Section VIII. 



The last column gives the calculated corrections to be applied at the 

 various temperatures to the observed resistances in the case of a 0.002 

 normal sodium chloride solution. It is given here, especially to show 

 the order of magnitude of these corrections. They were similarly 

 calculated for the other solutions. 



The Conductivity Data. — The first column in Table VI contains the 

 corrected temperatures, given in the order followed in the experiment. 



The second column gives the concentrations, corrected in the case of 

 the 140° and 218° values for the solvent in the vapor space. The cor- 

 rection is made as explained in Section VIII, and amounts to +0.05 

 per cent at 140° and +0.18 per cent at 218°. 



Tlie third column contains the observed resistances of the bomb, ex- 

 pressed in ohms, after correcting for errors in the resistance coils and 

 slide wire, and deducting the resistance of the lead-wires. 



The last column gives the equivalent conductivities, obtained by 

 dividin" the cell-constant for the given temperature by one one- 



