1881.] ^^'^ [Chase. 



Both in the centripetal and in the centrifugal abscissas, Neptune indicates 

 a reciprocal action, as if from a joint solar and stellar tendency, the solar 

 preponderatiniz:. The centripetal co-efficient Q) is reciprocal to that of 

 Saturn (|), Saturn's orbit embracing the primitive centre of rotating iner- 

 tia for the planetary portion of the nebula ;* the centrifugal co-efficient (|) 

 is the reciprocal of Earth's centripetal co-efficient (|).f 



All the centripetal abscissas represent loci of nebular subsidence, f^)^ 

 which would communicate velocities equivalent to the corresponding solar- 

 stellar parabolic velocities. 



All the centripetal abscissas, except Earth's, correspond most nearly 

 with mean planetary loci ; Earth's abscissa represents mean perihelion, or 

 the mean locus of maximum velocity, which is also the locus of belt forma- 

 tion (■-/y) in a nebula extending to Earth's mean perihelion distance. This 

 may account for the number and simplicity of the harmonic relations which 

 I have pointed out, between Sun's mass and distance and barometric pres- 

 sure, heat distribution, terrestrial magnetism, thermodynamic vis viva, ter- 

 restrial gravitation, sethereal and atmospheric inertia, specific gravities, 

 explosive energies, terrestrial rotation, lunar distance, lunar revolution, 

 planetary eccentricities, cosmical masses, nebular condensation, dissociation 

 and aggregation, spectral lines, thermal equivalence, atomicity, chemical 

 affinity, velocity of sound, and velocity of light. 



Since these results are derived from the hypothesis of equal gravitating 

 and sethereal action and reaction, we may infer that the density of the 



luminiferous aether, at Sun's surface, is ( ^) of the Sun's density, or 



(5 5 X 25535 773 \ 1 



T7W0^ ^ MdS =) 6821000000000 of the density of hydrogen. 



* Proc. Am. Phil. Soc. xii, 405 ; xviii, 431. 

 t See also lb. xvili, 231, 



