NOTES. CTXXV 



Hegel's " Leben von Rcsenkranz," 1844, S. 154). Kant, in his Natur- 

 geschichte des Himmels, 1755, merely deems that, in the formation of the 

 planets, Jupiter, by its enormous force of attraction, occasioned the smallness 

 of Mars. He mentions only once, and then in a very indefinite manner, 

 " the members of the solar system which are far asunder, and between which 

 the intermediate parts have not yet been discovered ; Glieder des Sonnen- 

 systems, die weit von einander abstehen, und zwischen denen man die Zwischen- 

 theile noch nicht entdeckt hat" (Immanuel Kant, Sammtliche Werke, Th. vi. 

 1839, S. 87, 110, and 196). 



( 604 ) p. 372. Respecting the influence of improved star maps on the dis- 

 covery of the small planets, see Kosmos, Bd. iii. S. 155 and 156; Engl. ed. 

 p. 98 and 99. 



(^ p. 372. D'Arrest iiber das System der kleineu Planeten zwischen 

 Mars und Jupiter (D'Arrest on the System of the Small Planets between 

 Mars and Jupiter), 1851, S. 8. 



( 60C ) p. 372. Kosmos, Bd. iii. S. 428 and 456; Engl. ed. p. 305306, 

 and 333334. 



(W) p. 374. Beujaimn Abthorp Gould (now at Cambridge, Massachusetts, 

 U.S.), Untersuchungen uber die gegenseitige Lage der Bahnen zwischen 

 Mars und Jupiter (Investigations respecting the Positions, relative to each 

 other, of the Orbits between Mars and Jupiter), 1848, S. 912. 



( 608 ) p. 374. D'Arrest, work above cited, S. 30. 



t 609 ) p. 374. Zach, Monatl. Corresp. Bd. vi. S. 88. 



( 61 ) p. 375. Gauss, in the same, Bd. xxvi. S. 299. 



( 6U ) p. 375. Mr. Daniel Kirkwood (of thePottsville Academy) has thought 

 it possible to undertake the hypothetical reconstruction of the original shattered 

 planet from the surviving fragments, after the manner followed in regard to 

 the remains of extinct animals. He assigns to the planet a diameter larger 

 than Mars (more than 1080 German, 4320 English, geographical miles), and 

 a rotation slower than that of any other planet, making the length of its day 

 57fc hours (Rep. of the British Assoc. 1850, p. xxxv.) 



( 612 ) p. 376. Beer und Madler, Beitrage zur phys. Kenntuiss der himml. 

 Kb'rper, S. 104 106. Older and more uncertain observations of Hussey 

 even gave ^. Laplace (Syst. du Monde, p. 266) finds theoretically, with 

 increasing density of the strata, between 2 J 7 and ^-. 



( 613 ) p. 376. Newton's immortal work, Philosophia Naturalis Principia 

 Mathematica, was published in May 1687, and the Memoirs of the Paris 

 Academy, containing the notice of Cassini's determination of the ellipticity 



