Vlll GENERAL SUMMARY 



The Moon of the Earth ; produces light and heat ; ash-gray 

 or earth-light in the Moon; spots; nature of the Moon's 

 surface., mountains and plains, measured elevations; pre- 

 vailing type of circular configuration ; craters of elevation 

 without continuing eruptive phenomena; old traces of 

 the reaction of the interior upon the exterior (the sur- 

 face) ; absence of Sun and Earth tides, as well of current* 

 as transportive forces, on account of the want of a liquid 

 element ; probable geognostic consequences of these re- 

 lations p. 141-159. 



Mars; ellipticity; appearances of surface altered by change 



of the seasons p. 159, 160. 

 The small planets p. 161, 162. 

 Jupiter: periods of rotation ; spots and belts p. 165-168. 



Satellites of Jupiter p. 169, 170. 

 Saturn : bands, rings, eccentric position p. 170-174. 



Satellites of Saturn p. 174, 175. 

 Uranus p. 175, 176. 



Satellites of Uranus p. 176, 177. 

 Neptune: discovery and elements p. 177-181. 



Satellites of Neptune p. 181-201. 



III. The Comets : with the smallest masses occupying immense 

 spaces ; configuration ; periods of revolution ; separation ; elements of 

 the interior comets p. 181-201. 



IV. The ring of the zodiacal light : Historical particulars. Intermit- 

 tence two-fold; hourly and annual? Distinction to be made between 

 the cosmical luminous process which belongs to the zodiacal light it- 

 self and the variable transparency of our atmosphere. Importance of a 

 long series of corresponding observations under the tropics at different 

 elevations above the sea from 9 to 12,000 feet. Reflection like that at 

 sunset. Comparison in the same night with certain parts of the Milky 

 Way. Question -as to whether the zodiacal light coincides with the 

 plane of the Sun's equator p. 201-204. 



V. Shooting stars, fire-balls, meteoric stones : Oldest positively determ- 

 ined fall of aerolites, and the influence which the fall of ^Egos Potamos 

 and its cosmical ex-plauations exercised upon the theories, of the uni- 

 verse of Anaxagoras and Diogenes of Apollonia (of the later Ionic 

 school): force of revolution which counteracts the power of the fall 

 (centrifugal force and gravitation) p. 204-209, note I, p. 207, and p. 

 209, note *. Geometric and physical relations of meteors in sporadic 

 and periodic falls; divergence of the t-hooting stars; definite points of 

 departure; mean number of sporadic and periodic shooting stnrs in an 

 hour in different months p. 209-214, note J, p. 210, and p. 211, note *. 

 Besides the stream of St. Laurentius, and the now more feeble Novem- 

 ber phenomenon, four or five other falls of shooting stars have be^n 

 discovered which very probably occur periodically during the year 

 p. 214, note *, p. 215, and p. 2~16, note *. Height and velocity of the 

 meteors p. 217. Physical relations, color and tails, process of com- 

 bination, magnitudes; instances of the firing of buildings p. 217. Me- 

 teoric stones ; falls of aerolites when the sky is clear, or after the for- 

 mation of a small dark meteoric cloud p. 220, note t, and p. 221, note *. 



