480 M. R. Kohlrausch's Theory of the 



the values of 7'^, thus calculated, may be compared with the ob- 

 served values : — 



Tabl 



e a" 



Table b"'. 



Table o"'. 



Whilst the calculated values in a"' and c"' are sometimes 

 greater and sometimes less than the observed ones, a more regu- 

 lar deviation is observed in b"' ; on the whole the calculated 

 curve is a little more curved than the observed one. As the cor- 

 respondence would not be improved by basing the calculation of 

 these curves on values of the constants deducible, by the method 

 of minimum squares, from all three, we must conclude that the 

 observed curve contains errors. In fact, it was not immediately 

 deduced from observation, but was obtained in § 4, by bringing 

 the loss of electricity into calculation ; and it is evident that this 

 method will be the more uncertain the longer the observation 

 lasted. In the present case, however, the first charge of the 

 bottle was observed for an hour and a half, and the collection of 

 the residue lasted twenty minutes ; so that a correspondence be- 

 tween calculation and observation, so great as is here manifested, 

 is rather to be wondered at, and places the certainty of the 

 method in a clear light. 



