CONTRIBUTIONS TO COSMOGONY AND THE FUNDAMENTAL PROBLEMS OF GEOLOGY 



ON CERTAIN RELATIONS 

 AMONG THE POSSIBLE CHANGES IN THE MOTIONS OF 

 MUTUALLY ATTRACTING SPHERES WHEN DIS- 

 TURBED BY TIDAL INTERACTIONS 



BY 



FOREST RAY MOULTON 



Associate Professor of Astronomy, University of Cliicago 



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