September 30, 1910] 



SCIENCE 



439 



TABLE I 



Negative drop 



Distance between cross hairs = 1.010 cm. 



Distance between plates = 1.600 " 



Temperature = 2-1.6° C. 



Density of oil at 25° C. = .8960 



Viscosity of air at 25.2° C. = .0001837 



G(sea.) F(sec) 



G = 22.28. 

 V= 7950 



V= 7920 

 6 = 22.80 - 



J'= 14.17 

 J'= 17.13 

 F = 10.73 



V= 7900 

 G = 22.82 

 ^=6.7 



1^=8.65 



J'= 10.63 



F=7820 

 G=^ 23.14 J 

 F = 9.57 



^=8.65 

 F = 12.25 



22.8 

 22.0 

 22.3 

 22.4 

 22.0 

 22.0 

 22.0 

 22.7 

 22^9 

 22.4 

 22.8 

 22.8 

 22.8 

 23.0 

 22.8 



22.8 

 22.8 



22.9 

 22.8 

 22.8 

 22.8 

 22.8 

 22.8 

 22.7 

 22.9 

 22.8 



22.8 

 23.1 

 23.2 



23.0 

 23.4 

 23.2 

 23.0 

 23.0 

 23.2 

 23.0 



22.9 



23.4 

 23.0 

 23.3 



29.0 

 21.8 

 17.2 



17.3 

 17.3 

 14.2 

 21.5 

 11.0 

 17.4 

 14.3 

 12.2 

 12.3 



14.2 



14.0 

 17.0 

 17.2 

 17.2 

 10.9 

 10.9 

 10.6 

 12.2 



8.7 



6.8-1 



6.6 ( 



7.21 



7.2 



7.3 



7.2 



7.4 



7.3 



7.2 J 



23.2 



S.6\ 

 8.7/ 

 1.8 1 

 1.8 J 

 ).7) 

 ).6i 



9.8 "1 

 9.8 i 



10 



10 

 9.6 1 

 9.6 

 9.6 I 



9.5 I 



9.6 1- 

 9.4 

 9.6 

 9.6 

 9.6 J 



10.6 

 8.7 1 

 8.6 J 



12.3 



12.2 



12.1 



12.4 



CXlOi" eiXlO'o 



84.47 

 39.45 



49.41 

 39.45 

 59.12 

 44.42 

 49.41 



53.92 



49.41 

 44.42 



59.12 



53.92 

 68.65 



68.65 

 63.68 

 59.12 



59.12 

 68.65 



4.923 

 4.931 



4.936 



4.941 

 4.927 



4.902 



4.941 

 4.936 



4.927 



4.902 

 4.904 



4.904 

 4.900 

 4.927 



4.900 



4.927 

 4.904 



y=7800 

 G:^23.22 



"F=7760 

 G = 23 43 



(J(sec.) i?(scc.) 



J' =39.18 

 F= 7730 -! 

 G = 23.46 



J" = 70. 65 



23.4 

 22.9 

 23.2 

 23.5 

 23.0 

 23.0 

 23.2 



23.3 

 23.3 

 23.4 

 23.3 

 23.2 

 23.4 

 23,2 

 23.4 

 23.8 

 23.4 

 23.1 

 23.5 

 23.4 

 23.6 

 23.4 

 23.6 

 23.4 

 23.5 

 23.4 

 23.2 

 23.4 

 23 6 

 23.3 

 23.4 



23.5 

 23.5 

 23.4 



23.6 

 Saw 



'0.8 ^ 



'0.4 y 



'0.6 J 



70 

 378.0 



e„X10io eiXlO" 



34.47 

 39.38 



24.60 

 19.66 



4.920 



4.922 

 4.923 



4.937 

 4.920 



4.920 



236 



23.6 



it, here, at end of 305 sec, 

 up two negatives 

 39.4 I 6 I 29.62 I 

 70.8 5 24.60 | 



4.937 



4.920 



4.915 

 I pick 



4.937 

 4.920 



Mean of all e^s = 4.917 



Change forced with radium. 



Differences 

 24.60 — 19.66 = 4.94 

 29.62 — 24.60 = 5.02 

 34.47 — 29.62 == 4.85 

 39.38 — 34.47 = 4.91 

 Mean dif. = IM 



23.43, the time of the drop in the field changed 

 suddenly from 71 seconds to 380 seconds, then 

 back to 71, then down to 39, then up again 

 to 71, and then up again to 380. These num- 

 bers show conclusively that the positive ion 



