xv NOTES. 



C 59 ) p. 130. Pfaff in W. Herschcl's sumratl. Schriften Bd. i. 1826, (S. 

 7881 ; Struve, Etudes stell. p. 3544). 



( 26 ) p. 130. Encke in Schumacher's Astr. Nachr. No. 622, (1847) S. 

 341-346. 



(* l ) p. 130. Outlines, p. 536. On the next page it is said, on the same 

 subject, " In such cases it is equally impossible not to perceive that we are 

 looking through a sheet of stars of no great thickness compared with the 

 distance which separates them from us." 



( 262 ) p. 131. Strnve, Etudes stell. p. 63. Sometimes the largest telescopes 

 reach a part of celestial space in which the existence of a remotely glimmering 

 sidereal stratum is only indicated "by an uniform dotting or stippling of 

 *he field of view." See in the Cape Observations, p. 390, the section " on 

 some indications of very remote telescopic branches of the Milky Way, or of 

 an independent sidereal System, or Systems, bearing a resemblance to such 

 branches." 



O p. 131. Cape Observations, 314. 



C 264 ) p. 131. Sir William Herschel in the Phil. Trans, for 1785, p. 21 ; 

 Sir John Herschel, Cape Observations, 293. (Compare also Struve, Descr. 

 de TObservatoire de Poulkova, 1845, p. 267271). 



t 265 ) p. 131. "I think," says Sir John Herschel, "it is impossible to 

 view this splendid zone from a Centauri to the Cross, without an impression, 

 amounting almost to conviction, that the Milky Way is not a mere stratum, 

 but annular ; or, at least, that our system is placed within one of the poorer 

 or almost vacant parts of its general mass, and that eccentrically, so as to be 

 much nearer to the region about the Cross than to that diametrically opposite 

 to it" (Mary Somerville on the Connection of the Physical Sciences, 1846, 

 p. 419). 



C 266 ) p. 131. Cape Observations, 315. 



( 287 ) p. 136. De admiranda Nova Stella anno 1572 exorta, in Tychonis 

 Brahe Astronomise instauratsc Progymnasmata 1603, p. 298 304 and 578. 

 I have followed in the text Tycho Brahe's own narrative. The unwarranted 

 assertion, repeated in many books on Astronomy, that Tycho's attention was 

 first called to the newly-appeared star by a concourse of country people has 

 not, therefore, been noticed. 



( 268 ) p. 136. Cardanus, in his dispute with Tycho Brahe, went back to 

 the star of the Magi, which he was disposed to identify with the star of 1572. 

 .ideler, from his calculations of conjunctions of Saturn with Jupiter, and from 



