Page:Philosophical magazine 21 series 4.djvu/303

Mercury and Venus.

D=36,298051=½ × 68,631843 + 1,982129,

^V/_D=0.0029760 = 2 × 0.0011651 +0.0006468.

Venus and Earth.

D = 68,631843 =½ × 94,885000 +21,189343, ^V/_D=0.00116510=2 × 0.00071676 -0.00026842.

Earth and Mars.

D= 94,885000 =½ × 144,575333 + 22,587334, ^V/_D=0.00071676=2 × 0·00038108 -0.00004540.

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Jupiter and Saturn.

D=493,654546 =½ × 905,087708 +41,110692, ^V/_D= 0.000060411 = 2 × 0.000024332 + 0.0000117470.

Saturn and Uranus.

D= 905,087708 =½ × 1820,020075 -4,922329, ^V/_D= 0.000024332 = 2 × 0.0000085313 + 0.0000072598.

Uranus and Neptune.

D=1820,020075 = ½ × 2849,991384 +395,024383, ^V/_D= 0.0000085313 = 2 × 0.0000043542-0.0000001871^[1].

6 Stone Buildings, Lincoln's Inn,

March 1861.

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XLIV. On Physical Lines of Force. By J. C. Maxwell, Professor of Natural Philosophy in King's College, London^[2].

[With a Plate.]

Part II. — 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-

1. 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, Jan. 11, 1861.
2. Communicated by the Author.