809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831  
( 828 ) obtaining a good constancy of (38). The results are contained in the following tables, corresponding to the tables III and IV in Kaufmann's paper. III. s = 0,933.
The constancy of is seen to come out no less satisfactory than that of k_{3}, the more so as in each case the value of s has been determined by means of only two measurements. The coefficient has been so chosen that for these two observations, which were in Table III the first and the last but one, and in Table IY the first and the last, the values of h'_{s} should be proportional to those of I shall next consider two series from a later publication by Kaufmann^{1}), which have been calculated by Runge^{5}) by means of the method of Kaufmann, Goll. Nadir. Matli. phys. Kl., 1903, p. 90. *) Runge, ibidem, p. 326. IV. * = 0,954.
 ( 829 ) least squares, the coefficients and k_{3} having been determined in such a way, that the values of v, calculated, for each observed £, from Kaufmann’s equations (34), agree as closely as may be with the observed values of •»;. I have determined by the same condition, likewise using the method of least squares, the constants a and b in the formula r which may be deduced from my equations (36) and (37). Knowing a and b, I find /? for each measurement by means of the relation For two plates on which Kaufmann had measured the electric and magnetic deflexions, the results are as follows, the deflexions 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 tj 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 — 0,06489, b = 0,3039.
