( 829 ) 



least squares, the coefficients Ic^ and l\ liaving l)een determined in 

 such a way, that tiie vahies of r^, calculated, for each observed S, 

 from Kaufmann's equations (34), agree as closely as may t)e with 

 the observed values of i^. 



I have determined by the same condition, likewise using the method 

 of least squares, the constants a and h in the formula 



wliich may be deduced from my equations (36) and (37). Knowing 

 a and h, I tind i? for each measurement by means of the relation 



For two plates on which Kai fmann had measured the electric and 

 magnetic detlexions, the results are as follows, the detlexions being 

 given in centimeters. 



I have not found time for calculating the other tables in Kaufmann's 

 paper. As they begin, like the table for Plate 15, with a rather 

 large negative difference between the values of ^] which have been 

 deduced from the observations and calculated by Runge, we may 

 expect a satisfactory agreement with my formulae. 



§ 14. I take this opportunity for mentioning an experiment that 

 Plate N". 15. a = 0,064.89, 6 = 0,3039. 



