OF CONTENTS. IX 



Problematical abundance of the shooting stars between midnight and 

 the early hours of morning (hourly variations) — p. 222. Chemical re- 

 lations of the aerolites ; analogies with the constituents of telluric rock 

 —p. 223-226. 



Conclusion : Retrospect of the undertaking. Limitation consistent 

 with the nature of a physical description of the universe. Representa- 

 tion of the actual relations of cosmical bodies to each other. Kepler's 

 laws of planetary motion. Simplicity of the uranological problem in 

 opposition to the telluric, on account of the exclusion of material hete- 

 rogeneity and change. Elements of the stability of the planetary sys* 

 tern— p. 227-230. 



A 2 



