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 3 



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CONTENTS OF VOL. III. 



INTRODUCTION. 



rags 



Historical Review of the attempts made with' the object of 

 considering the Phenomena of the Universe as a Unity 

 of Nature 5-25 



SPECIAL RESULTS OF OBSERVATIONS IN THE 

 DOMAIN OF COSMICAL PHENOMENA 



A. Uranolqgical portion of the physical description of the 



world. a. AsTROGNOsy 26-28 



I. The realms of space, and conjectures regarding that which 



appears to occupy the space intervening between the 

 heavenly bodies 2941 



II. Natural and telescopic vision, 41-73 ; Scintillation of the 



stars, 73-83 ; Velocity of light, 83-89 ; Results of pho- 

 tometry, 89-102 41-102 



III. Number, distribution, and color of the fixed stars, 103- 



139; Stellar masses (stellar swarms), 139-143.; The 

 Milky Way interspersed with a few nebulous spots, 

 1 43-1 51 103-151 



IV. New stars, and stars that have vanished, 151-160; Va- 



riable stars, whose recurring periods have been determ- 

 ined, 160-177; Variations in the intensity of the light 

 of stars whose periodicity is as yet uninvestigated, 177- 

 182 151-18? 



V. Proper motion of the fixed stars, 182-185 ; Problemat 



ical existence of dark cosmical bodies, 185-188 ; Par- 

 allax measured distances of some of the fixed stars, 

 188-194; Doubts as to the assumption of a central 

 body for the whole sidereal heavens, 194-199 182-199 



VI. Multiple, or double stars Their number and reciprocal 



distances. Period of revolution of two stars round a 

 common center of gravity 1 99-213 



59G927 



