RALPH S. LILLIE 



121 



experiments the intervals between the successive activations in any 

 series were adjusted to the time period of recovery characteristic of 

 the solution used, as given in Table II . In each series (with a few 

 exceptions) ten wires were used, with the procedure already described. 

 The number of separate determinations for each of the average dis- 

 tances given in Table III varied from twelve to nineteen (in a few 

 cases more) , except in those cases where part of the wires had recovered 



Fig. 1. Distances traveled by activation wave in different solutions of HNO3 

 at different intervals after a previous complete activation in the same solution. 

 Ordinates are distances (cm.); abscissae are times (minutes) elapsed since the 

 previous activation. A single curve represents the behavior in acid of the con- 

 centration indicated at the end of the curve (in volumes per cent of HNO3, sp. 

 gr. 1.42) at 20°. The small circles represent the averages given in Table III. 



completely in the time allowed; in these cases the number of deter- 

 minations is given in brackets. When plotted with distances as or- 

 dinates and times as abscissae the data give curves of an hyperbola- 

 like form, beginning with a horizontal and ending with a vertical 

 course (Fig. 1). 



