PE. Chase on the relations of Gravity and Magnetism. 315 
~ the lunar by A”, the respective barometric disturbances by B’ 
and B”, and the magnetic disturbances by M’ and M”. If M’ 
md BY are required, we have | 
i t A” 
; cea - B’ BY M’ M” 
Theoretical values, ‘00012 00144 
Observed +“ 255 00057 °00013 00140 0000255 
VII. The theoretical gravitation-variation of magnetism 
(Prop. IV) is slightly less, while the theoretical barometric vari- 
ation (Prop. VII) is slightly greater, than the corresponding ob- 
_ferved variation. The excess in one case exactly counterbal- 
- anees the deficiency in the other, the sum of the theoretical be- 
op ely equal to the sum of the observed variations. : 
_ IX The total daily magnetic variations, like the barometric, 
tan be resolved into ‘a variety of special tides, which may be 
- feverally explained by well-known constant or variable current- 
Producing and weight-disturbing forces. 
i A B A+B 
| 4, Hous Theoretical Theoretical Theoretical Observed 
Bes a Gravitation Differentia Mean —— 
 (ebenight. Tide. Solar Tide. Tide. Tide. 
0 —00067 | + 00024 —-00043 — 00043 
6 00000 —-00024 — 00024 — "000234 
+-00067 | +-00024 | -+-00091 | 00095 
Ng the fluctuations as uniform between successive hourly obser- 
_ Sand 184, respectively. The mean retardation is 50’, or 4's 
-day. The theoretical daily gravity-variation 
» the average variation in 7; of a half-day is 0000933, the 
Still there are indications, 
Owing synopsis, of the influence of gravity, sufficiently 
