If we compute the speeds of satellites about their primaries in the solar system and compare them with the velocities in their orbits of the planets themselves, a striking parallelism stands displayed between the several systems. This is shown in the following table of them: ==============+============================+===========+============ | | PARABOLIC | | MEAN SPEED, | SPEED AT | RATIO SPEED | MILES A SECOND | ORBIT | SAT. ABOUT +------------+---------------+-----------+ PRIMARY TO | of Primary | of Satellite | Miles a | PLANET’S | in Orbit | about Primary | second | SPEED | _V_ | _v_ | | IN ORBIT --------------+------------+---------------+-----------+------------ Jupiter | 8.1 | | 11.5 | Sat. 1 | | 10.7 | | 1.32 2 | | 8.5 | | 1.05 3 | | 6.7 | | 0.83 4 | | 5.1 | | 0.63 Saturn | 6.0 | | 8.5 | 1 | | 9.0 | | 1.50 2 | | 7.9 | | 1.31 3 | | 8.2 | | 1.36 4 | | 6.3 | | 1.05 5 | | 5.3 | | 0.89 6 | | 3.5 | | 0.59 8 | | 2.0 | | 0.34 Uranus | 4.2 | | 5.9 | 1 | | 3.5 | | 0.82 2 | | 2.9 | | 0.70 3 | | 2.3 | | 0.54 4 | | 2.0 | | 0.47 Neptune | 3.4 | | 4.8 | 1 | | 2.7 | | 0.81 ==============+============+===============+===========+============ The relations here disclosed are too systematic to be the result of chance. The orbits of all these satellites have no perceptible eccentricity independent of perturbation except Iapetus, of which the eccentricity is about .03.