Theory of Molecular Vortices applied to Electric Currents. 281 
Mercury and Venus. 
= 36,298051 =} x 68,631843 + 1,982129, 
= (00029760 =2 x 0:0011651 + 0-:0006468. 
ei< 5 
Venus and Earth. 
D=68,631843 =+4 x 94,885000 + 21,189343, 
=0:00116510=2 x 0:00071676 — 0:00026842. 
Earth and Mars. 
D=94,885000 = x 144,575333 + 22,587334, 
‘ = 0:00071676=2 x 0:00038108 — 0:00004540. 
cl< 
Jupiter and Saturn. 
D=493,654546 = x 905,087708 +41,110692, 
n=0 000060411 = 2 x 0:000024332 + 0:0000117470, 
Saturn and Uranus. 
D=905,087708 =4 x 1820,020075 —4,922829, 
is = 0°000024382 = 2 x 0:0000085318 + 0:0000072598. 
Uranus and Neptune. 
D=1820,020075 =4 x 2849,991384 +395,024383, 
r=0 0000085313 =2 x 0:0000043542 — 0:0000001871*. 
6 Stone Buildings, Lincoln’s Inn, 
March 1861. 
XIV. On Phy silt vac of F Foree ce. By y ule C. Meera Pro- 
fessor of Natural Philosophy in King’s College, Londont. 
[With a Plate. ] 
Part I1.—The Theory of Molecular Vortices applied to Electric 
Currents. 
WE have already shown that all the forces acting between 
magnets, substances capable of magnetic induction, and 
electric currents, may be mechanically accounted for on the sup- 
* This fifteenth paragraph may be taken as an abstract of my paper 
“On the Revolutional Velocities and Distances of the Planets,” read before 
the Royal Astronomical Society,glan. 11, 1861. 
+ Communicated by the Author. 
