NOTES. 



( 372 ) p. 222. " Dans les deux nebuleuses d'Andromede et d'Orion," says 

 Dominique Cassini, " j'ai vu des etoiles qu'on ii'aperoit pas avec des lunettes 

 communes. Nous ne savons pas si Ton ne pourroit pas avoir des lunettes 

 assez grandes pour que toute la nebulosite put se resondre en de plus petites 

 etoiles, comme il arrive a celles du Cancer et du Sagittaire" (Delambre, Hist, 

 de 1'Astr. moderne, T. ii. p. 700 and 744). 



C 73 ) p. 222. Kosmos, Bd. i. S. 412, Anm. 66 (Eugl. edit. Note 96). 



( 374 ) p. 223. On the ideas of Lambert and Kant viewed in connection with 

 each other, what they had in common, and wherein they differed, as well 

 as on the dates of their publications, see Struve, Etudes d'Astr. stellaire, p. 

 1 1, 13, and 21 ; Notes 7, 15, and 33. Kant's " Allgemeine Naturgeschichte 

 xmd Theorie des Himmels" (General History of Nature and Theory of the 

 Heavens) appeared anonymously, and with a dedication to the King of 

 Prussia, in 1755 ; Lambert's " Photometria," as has been already remarked, 

 appeared in 1760, and his "Sammlung kosmologischer Briefe iiber die Ein- 

 richtung des Weltbaues" (Collection of Cosmological Letters on the Structure 

 of the Universe) in 1761. 



t 375 ) p. 223. "Those nebula," said John Michell, 1767 (Phil. Trans. 

 Vol. Ivii. for 1767, p. 251), "in which we can discover either none or only 

 a few stars even with the assistance of the best telescopes, are probably sys- 

 tems, that are still more distant than the rest." 



( 376 ) p. 224. Messier, in the Mem. de 1' Academic des Sciences, 1771, p. 

 435 ; and in the Connaissance des Temps pour 1783 and 1784. The whole 

 list contains 103 objects. 



C* 7 ) p. 224. Phil. Trans. Vol. Ixxvi., Ixxix., and xcii. 



I 378 ) p. 224." The nebular hypothesis, as it has been termed, and the 

 theory of sidereal aggregation, stand in fact quite independent of each other" 

 (Sir John Herschel, Outlines of Astronomy, 872, p. 599). 



( 379 ) p. 225. The numbers in the text are those of the objects euumerated 

 from No. 1 to 2307 in the European or Northern Catalogue of 1833, and 

 from No. 2308 to 4015 in the African or Southern Catalogue (Cape Obser- 

 vations, p. 51 128). 



t 380 ) p. 225. James Dunlop, in the Phil. Trans, for 1828, p. 113151. 



t 381 ) p. 225. Compare Kosmos, Bd. iii. S. 81 and 117, Anm. 34 (English 

 edit. p. 63, Note 123). 



C) p. 225." An Account of the Earl of Rosse's Great Telescope," p. 

 1417, in which the list of the nebulae resolved in March 1845 by Dr. 

 Robinson and Sir James South, is given. " Dr. Robinson could not leave 



