RALPH S. LILLIE 



123 



variations in the finer grain of the metal, involving irregular local 

 potential differences which influence the local rate of reaction and 

 interfere somewhat with the uniformity of the reaction at different 

 regions of the surface layer. In Fig. 2 the averages for the different 

 solutions of these series are plotted and curves drawn as before. 

 These averages are given in Table V. 



TABLE IV. 



Wire. 



Distance traveled. 



Intervals since previous activation. 



Series 1. Concentration of HNO3, 65 volumes per cent. Temperature 20°C. 



In this arrangement the horizontal lines give the results for the same wire with 

 varying intervals before reactivation. Any single series is to be read along the 

 diagonals from above down, beginning with the first column, in such a way that 

 the letters fall in consecutive order. 



