xv NOTES. 



C") p. 123. Delambre, Hist, de 1'Astr. Moderne, T. i. p. 697. 



( 245 ) p. 124. We are indebted for the first and the only thoroughly com- 

 plete description of the Milky Way in both hemispheres to Sir John Her- 

 schel, in his " Results of Astronomical Observations made during the years 

 18341838, at the Cape of Good Hope," 316335, and still more 

 recently in his Outlines of Astronomy, $ 787 799. I have followed him 

 throughout the entire section of Kosmos which is devoted to the direction, 

 branchings, and varied contents of the Milky Way. Compare also Struve, 

 Etudes d'Astr. stellaire, p. 3579; Madler, Astr. 1849, 213; Kosmos, 

 Bd. i. S. 109 and 156 (English edition, pp. 96 and 140). I need scarcely 

 remark here, that, in order not to mingle uncertainties with certainties, I 

 have not introduced into the description of the Milky Way, what I observed 

 and recorded respecting the very unequal light of the different parts of the 

 gallactic zone during my long sojourn in the Southern Hemisphere, where 

 the instruments with which I was provided commanded but little light. 



( 246 ) p. 124. The comparison of the Milky Way to a Celestial River 

 caused the Arabs to give to parts of the constellation of Sagittarius, whose 

 bow falls in a region full of stars, the name of " cattle going to drink," and 

 even accompanying them by the ostrich, which requires so little water. 

 (Tdeler, Untersuchung iiber den Ursprung und die Bedeutung der Sternnamen, 

 S. 78, 183, and 187; Niebuhr, Beschreibung von Arabien, S. 112.) 



( 247 ) p. 124. Outlines, p. 529 ; Schubert, Astr. Th. iii. S. 71. 



( 248 ) p. 124. Struve, Etudes d'Astr. stellaire, p. 41. 



( 249 ) p. 125. Kosmos, Bd. i. S. 156 and 415 Anm. 79 (English edition, 

 p. 140, and Note 109). 



(^p. 125. "Stars standing on a clear black ground" (Cape Ob- 

 servations, p. 391). This remarkable belt (the Milky Way, when examined 

 through powerful telescopes) is found (wonderful to relate!) to consist 

 entirely of stars scattered by millions, like glittering dust on the Hack 

 ground of the general heavens." Outlines, p. 182, 537, and 539. 



( 2SI ) p. 125. " Globular clusters, except in one region of small extent 

 (between 16h. 45m. and 19L in R. A.) w&nebula of regular elliptic forms, 

 are comparatively rare in the Milky Way, and are found congregated in the 

 greatest abundance in a part of the heavens the most remote possible from 

 that circle." Outlines, p. 614. Huygens, as early as 1656, had had his 

 attention drawn to the absence of nebulae and nebulous patches in the Milky 

 Way. In the same place in which he mentions the discovery and repre- 

 sentation of the great nebula in the belt of Orion, by means of a 28-feet 



