Xll CONTENTS. 



annalists, and problematical obscurations or eclipses, p. 282 

 283 and xcviii. cii. Note 481. Intensity of light of the solar 

 disk at the centre and at the edges, p. 283288 and cii. ciii. 

 Notes 483 484. Connection between light, heat, electricity, 

 and magnetism ; Seebeck, Ampere, Faraday, p. 288 290. 

 Influence of the solar spots on the temperature of our 

 atmosphere, p. 291295. 



II. The Planets. 



A. General comparative considerations. 

 a. Primary Planets. 



1. Number and epochs of discovery, p. 297 304. 

 Names, planetary days (days of the week), and 



planetary hours, p. cvi. cxiv. Notes 505 506. 



2. Distribution of the planets into two groups, p. 



304309. 



3. Absolute and apparent magnitudes and external 



figure, p. 309 312. 



4. Arrangement of the planets according to their 



distances from the Sun ; so-called law of Bode, 

 or rather of Titius; notice of an ancient 

 belief that the heavenly bodies which we now 

 see have not all been always visible, but that 

 there were in some countries pre-lunar men, or 

 " Proselenes," &c. ; p. 312322, and cxv. 

 cxxi. Notes 510526. 



5. Masses of the Planets, p. 322323. 



6. Density of the planets, p. 323324. 



7. Sidereal periods of revolution and rotation round 



the axis, p. 324326. 



8. Inclination of the planetary orbits and axes of 



rotation, influence upon climates, p. 326 333 

 and cxxii. Note 534. 



9. Excentricity of the planetary orbits, p. 333337. 

 10. Strength of the Sun's light on the different 



planets, p. 337338. 



0. Satellites, p. 338343. 



