Chase. ] 102 [July 20, 
comparison, and like the present comparatively nebulous condition of Sat- 
urn itself, to Saturn as an important centre of early ring aggregation, as if 
our nebula were, at first, a ring vortex. The indication is confirmed by the 
similar densities of Saturn and Neptune ; the similar densities of Uranus, 
Jupiter and Sun ; the fact that ‘‘these four planets form a system by them- 
selves, which is practically independent of the other planets of the sys- 
tem;’’* the present approximate accordance between the transit of light 
through the Uranus-Telluric major-axis and the limit of planetary velocity 
at Sun’s surface ; and the following comparison between the 2d and 3d 
condensation falls : 
Rad. Vee. 2a C. Fall. 3d C. Fall. Rad. Vee, 
6 a 20.68 20.67 UG Tl Gia 1.74 
bh a 10.34 10.38 89 Bp .98 
Y 5.20 5.17 AA sa .48 
Ast. 2.59 2.09 .22 Wa 2 
If the 3d fall had been counted from Saturn’s secular perihelion instead 
of from his secular aphelion, the distance would have been .75, Venus’s 
mean aphelion being .75. 
The peculiar indication of the Uranus-Telluric ellipse, the central posi- 
tion of Earth in the belt of greatest density, and the absence of any ex- 
plicit indication of our planet in most of the foregoing comparisons, sug- 
gest the possibility that its place may have been fixed by a special law. 
Its secular perihelion (.93226) is near the fifth rupturing node of Neptune’s 
mean distance (30.03386 = 2° = .93856). 
The stellar-Solar parabola points to a time when @ Centauri may have 
been at a nebular rupturing point, relatively to the Sun. The lowest and 
9 
highest estimates for — a@ Centauri, are, respectively, 28905200 and 
30895100 solar radii. The seventh fall of condensation (1 -- 11.656854)’, 
would give .9883 and 1.0564, showing a closeness of approximation to the 
present solar radius which can hardly be thought accidental. As there 
~ 
are two falls of condensation between — Earth and Sun, there are five 
falls between @ Centauri and Earth ; the extreme range of estimates for @ 
Centauri + 11.656854° being between .9818 and 1.0494 times Earth’s mean 
radius vector. Both of these points are within the Earth belt (p = .9323, 
@ =1.0677%). 
Neptune’s secular eccentricity seems to have been determined by the 
combined influence of condensation-fall, orbital collision, and rupturing 
nodes. For Neptune’s secular perihelion — 11.656854 = 2.53912 ; 2 sec. 
aph. = 23 = 2.53913. 
The gegenschein, and other indications that the Zodiacal light may be 
partly owing to the remains of an early terrestrial ring, may naturally 
lead us to look for evidences of residuary activity in some of the outer 
* Stockwell; Smith, Con. 232, xiii. 
