50 



INDEX CATALOGUE. 



Secchi : Mon. Not. R. A. S., xviii, p. 8. [Nebula of Orion; h. 3721 ; on 

 the distribution of the globular clusters.] 



: Mon. Not. R. A. S., xxv, p. 153. [Spectrum of nebula of Orion.'} 



: Mon. Not. R. A. S., xxviii, p. 1G2. [Nebula of Orion.] 



: Mon. Not. R. A. S., xxix, p. 165. [Nebula of Orion.] 



: C. R-, xliv, p. 1279, and xlv, p. 170. [Porro's new star in the 



nebula of Orion.] 



: C. R., lv, p. 751. [Sur les nebuleuses annulaires.] 



: C. R., vol. lx, 18G5, i, p. 543. [Spectrum of Orion nebula.] 



: C R., vol. lxv, 18G7, p. 63. [Nebula of Orion.] 



• : C. R., vol. Ixvi, 1868, p. 643. [Nebula of Orion and spectrum.] 



: Der Naturf or acker, i, 279 ; ii, 279, 356. 



[ ] : Ast. Jour., iii, 71. [Discovery of a new double nebula.] 



Severn, H. A. : Mon. Not. R. A. S., xxx, p. 180. [Note on rj Argus.] 

 Senarmont : 0. R., xliv, pp. 1075, 1294. [Porro's new star in Orion.] 

 Sidereal Messenger : 



Silliman's Journal : See American Journal Science. 



Smith : Opticks. 4°. [Huygiiens' drawing of nebula of Orion, etc.] 



Smyth, W. H. : Cycle of celestial objects. Two vols., 8°. 1844. [Con- 

 tains observations and sketches of nebulae.] 



: Speculum Hartwellianum. 1860. [p. 285, Andromeda; 290, 



dumb-bell, p. iii ; nebular hypothesis ; see also pp. 254-334 and 

 various observations scattered through the work.] 



Southern Quarterly Review : Vol. x, p. 227. [On the nebular hypoth- 

 esis.] 



[Spencer, Herbert] : Recent astronomy and the nebular hypothesis. 

 Westminster Review, vol. xiv, 1858, p. 185. [A theoretical view 

 of the origin and condition of nebulas, etc.] See Nature, vol. i, 

 p. 359. 



Spettroscopisti : Italiani [Socictd] Memoric. 1875, p. 109. Bredichin. 



Stephan : Bull. Ast. de I'Obs. de Paris, i, p. 8. [Discovery and observa- 

 tions of new nebula;. 



