and 



of certain Chemical Actions, etc. 



In figure (1)* the curve 



y = 1 — e~ x is plotted. 



This corresponds to the observations if we make 

 sb= -00425 £, 

 G 



273 



y 17.350 ' 



where C is the change of conductivity multiplied by 10 6 . 



The points representing the experimental numbers are found 

 to lie very well on the curve. 



It is interesting to compare the values for the constant of the 

 action by this method with those obtained by Buchanan. The 

 following table + contains Buchanan's results for the action at 

 100° C. 



t 



k x 10 5 



2 



15-8 



3 



195 



4 



19-2 



6 



17-0 



10 



18-4 



13 



17-6 



19 



17-3 



25 



16-5 



34-5 



18-7 



43 



15-5 



48 



15-9 



The constant here obtained is plainly not so good as that on 

 p. 271. 



We may conclude then from this experiment that this method 

 enables us to follow such an action, and in virtue of the fact that 

 the change of conductivity is so large we can observe closely the 

 initial stages of the action. 



Experiments were made with solutions of different strengths 

 and readings of the resistance were taken as soon after the begin- 

 ning as possible. 



* In Figure 1 the continuation of the curve is transferred to the left-hand side 

 of the figure. 



t Ostwald, Lehrbuch der Allgemeinen Chemie, Verwandschaftslehre, p. 208, and 

 Van 't Hoff, Studies in Chemical Dynamics, p. 14. 



VOL. XIII. PT. V. 19 



