RECAPITULATION 157 



9. The cause of the excitation of comets when 

 Hearing the sun. (It is not chiefly attributable to the 

 sun's heal, but to the comet's internal struggle for 

 equilibrium ) . 



10. Terrestrial magnetism due to tidal friction. 



Srn PRINCIPLE III. (irari-tnt-ion beiity a form of 

 energy, it is convertible into other for nix; and being 

 likewise inseparable from matter,, it must continu- 

 ously evince itself. This it does by pressure on 

 matter, whose molecules fret under the strain and 

 thereby create heat. In the case of rcry la rye bod- 

 ies,, like the -////, the pressure is sufficiently (/rent to 

 volatilize all its substance*, cyclically, by percus- 

 sion. 



This sub principle, when taken in connection with 

 those previously enunciated, explains: 



1. The cause of solar, stellar, and planetary heat. 



2. Why heavenly bodies are hot in the ratio of 

 their size. 



.'$. Why the oceans of Mercury and the moon are 

 congealed, those planets by reason of their small mass 

 being gravistatically incapable of generating sufficient 

 heat to keep their waters fluid. 



4. Why the earth's and Mars' oceans are not 

 frozen solid. 



5. Why the earth has not exploded by reason of 

 the enormous temperature of its interior, as predicated 

 by current theory. 



6. How the earth maintains an even temperature 

 by means of its central water-cooling system. 



7. Why it is so rigid, and its earthquakes super- 

 ficial. 



