1883.] 593 [Chase. 



Stockwell, are respectively, I of one per cent., :^^ of one per cent, and j\ 

 of one per cent. The three terms which indicate mere photodynamic pro- 

 gression sliow an exact accordance ; but there is a range of uncertainty 

 which is of the same order of magnitude as planetary eccentricities, with 

 regard to the exactness with which the third of those terms represents the 

 locus of a Centauri. The harmonic term preceding the solar modulus is 

 7.466 times Neptune's semi-axis major. It has no obvious known repre- 

 sentative, but future researches or discoveries may make it significant. 

 The Terrestrial and the Stellar-Photic series are connected by the propor- 

 tion : 



These several relations confirm the views which were expressed in 

 Note 262. 



364. PhotodynamiG Sabddence-Rclatioti of Eartli and Jupiter. 



The photodynamic projections of /? from Sun's rupturing locus, of the 

 chief centre of gravity (Sun and Jupiter) from Sun's surface, of the centre 

 of the dense belt from the chief centre of condensation, and of f,^ from Nep- 

 tune's locus of incipient subsidence, seem partly to account for the photo- 

 dynamic gravitating relations of Earth's day and year. The radius vector 

 of the viscous rupturing locus of Jupiter's incipient subsidence (Note 355) 

 is 1.0304137. If <3 = 1 year, we have, very nearly if not exactly, the equa- 

 tions : 



^3^3=1.0304137 V 



B^ = 186135.8 miles. 



^3 =93,659,000 miles. 



m^ = 330,419 m^. 



365. Conservative Momentum of Vis Viva. 



"Whether we accept or reject the hypothesis of Lesage, as a literal ex- 

 planation of gravitating action, it may serve as a convenient concept for 

 representing activities which are obviously incessant. Ther'e are con- 

 stant centripetal tendencies towards the Sun, as well as constant radiations 

 from the Sun, each varying inversely as the square of the distance, and 

 each subject to the law of equality between action and reaction. Lesage 

 supposed that they were opposite phases of a single energy, and his views 

 are favored by the law of parsimony. If we reject them altogether, our 

 perplexity is doubled, for we have two reactions to account for, instead of 

 one. Even Newton, Peirce and Helmholtz ; the first, in his hypothesis 

 of an "jBthereal spirit," the others in seeking an equivalent between solar 

 radiation and solar contraction ; were guided, though less directly, by 

 the law of action and reaction. In circular orbital motion, centripetal 

 gravitation continually deflects the tangential path, so as to make it tt times 

 as long as the radial path before the tangential oscillation reverses its di- 

 rection. The influence of momentum in such a change is represented by 

 the terrestrial series (Note 363); the influence of ots w«a, in the stellar- 



