1880.] 



431 



[Chase. 



.(5. 



Ps Ps 2 P A t 



19,385ft, 8 __ 329200 X 5074 sec. 

 329,200/> 3 2 _ 1 X 31558150 sec 

 /> 8 = 29.993G/> 3 



The Saturnian orbit embraces the primitive centre of rotating inertia ; 

 Saturn's mean position having been influenced by the locus of reciprocal 

 rupture (Neptune's m. p.*), the two chief points of incipient condensa- 

 tion (Jupiter's s. a. and Saturn's s. a.), and the mean positions of the other 

 planets, as will be seen by the following table, in which Sun's mass — 

 10,000,000,000 : 



Saturn's mean radius-vector is 9.539/'.,. The above result, therefore, 

 indicates a slight preponderance, beyond the orbit of Neptune, of the un- 

 known cosmical matter in our system. If the influence of all this un- 

 known preponderance is equivalent to that of a mass about as great as 



Earth, at the locus of incipient subsidence (2"> = 6~V S )> the mean moment 

 of nebular rotation of each planet is represented by Saturn's mean position. 



*«, aphelion; p, perihelion ; wi, mean ; s, secular. 



