

NEBULA, CLUSTERS, ETC. 55 



Sclrweizer : Annalcs de l'Observatoire de Moscou, vol. i, 1874, pp. 58, 60, 

 No. 821, nebulous star? a' = 17 b 44 m 52.13, 6' — + 2° 56' 15."4 

 place for 1858, June 13. 



: See Bredichin. 



Scientific Opinion : Vol. Hi, p. 250. Le Sueur 

 Secchi : Quadro Fisico del Sistema Solare, 1859. 

 . : Le Soleil, 8vo, 1st ed'n, p. 400. 



: R. Inst. Lombardo Sci. e Lett. Rendiconti, x, fasc. 111. [On a 



dark spot in the milky way.] 



: Atti d'Ac. d. N. Lincei, vol. vii, 1856, p. 67. 



: Same, vol. xxi, sess. iv, 1868, p. 15. [Aa and AS of three plane- 

 tary nebulas with neighboring stars.] 

 : Same, anno xxv, sess. iv, 1872, pp. 49-50. [Spectra of nebulae of 



Lyra, Orion, etc., and of clusters in Libra, 53 M., etc.] 



: Sugli Spettri Prismatici. Mem. i, 18G8. Attid. Soc. Ital. dei XL 



: Sugli Spettri Prismatici. Mem. ii, 1869. Attid. Soc. ftal. dei3Z.lt 



: Sugli Spettri Prismatici. Mem. iii, 1872. Atti d'Ac. N. Lined, 



vol. xxv, p. 49. 

 : Sulla grande nebulosa di Theta Orione. 1868. 4°. Mem. Ital. 



Soc. Firenze, vol. i, 3d series, part 2, [with a plate and account 



of spectroscopic observations.] 

 : Accad. d. N. Cimcnto, serie 2 a , vol. v-vi, 1872, p. 20, paragraph 6°. 



[Relative intensity of the solar Corona and the nebula of Orion, 



etc. The Corona is brighter.] 

 ■ : Eloge of De Vico, with account of his work on nebula?. Man. 



delVOss. Coll. Romano, 1850, p. 141. 

 : Mem. delVOss. Coll. Romano, 1852-1855, p. 80, and plate iv [16 



figures,] plate v [5 figures, one of nebula of Orion.] 

 : [New star in trapezium of Orion.] Mem. dcll'Oss. Coll. Romano, 



1856-7, p. 3. 

 : Bull. Meterolog. d. Coll. Romano, 1865, January. [Nebula of 



Orion.] 

 : A. .A 7 ., xxxvi, col. 243. [Discovery of a double nebula = H, ii, 



28-29, according to D' Arrest, A. N., xli, col. 192.] 

 Sur la nebuleuse annulaire. 1855. A. N., xxxix, col. 262. 

 Observations des nebuleuses. A. N., xliii, col. 157. 

 A. N., xlv, col. 60. [Nebula of Orion, with sketch.] 

 A. N., lxv, col. 2G2. [Remarks on several nebula?; changes in 



M. 1 ; spectra of h. 2047 and G. C. 4514.] 

 : A. X., lxvi, col. 161. [Observations of new nebulae.] 



