NEBULA, CLUSTERS, ETC. 9 



Bond G. P. : In tao Harvard Coll. Obs'y Zones, Annals, vol. i, are 8 

 ' nebula : [1] Z. 14, 10 ; [3] 50, 54 ; [2] 38, 39 ; [1] 2G, 27 ; [1] 

 22, 23. 



: Annual Reports of Director of llarv. Coll. Obs'y, 1859-64. 8vo. 



[Progress of work on nebula?, etc.] 



Bond, \Y. C: Annual Reports as Director of Harv. Coll. Obs'y, giving 



prpgress of work on nebulae. [184G-55,] vol. i, Canals Harv. 



Coll. Obs'y, p. lxvii, et seq. 

 : Description of tbe nebula about Orionis. Mem. A. A. S., iii, 



1848, p. 87, [with steel engraving.] 



: Annals Harv. Coll. Obs'y, i, p. 2G5. [Obs. of H, i, 15.] 



: A. A. S. Proc, i, p. 165. [Dumb-bell nebula = M. 27.] 



.. : A. A. S. Proc, i, p. 325. [Observations of h. 1357, h. 1376, h. 



859, and nebula of Orion.'] 

 : Same volume, p. 342. [Resolvability of nebula of Orion.] See 



also Am. Jour. Sci., 2d series, iv, p. 427. 



Borelly : Bulletin Ast. de VObs. de Paris ; i, p. 162. [Discovery of several 



nebulae.] 

 : A. N., lxxix, col. 205. [Discovery of a nebula.] 



Bradley : Observations of two nebulce. 1727, Feb. 16. Bradley's Mis- 

 cellaneous Works, [Rigatjd,] p. 861. 



Brayley : Proc. R. S., xiv, p. 120. [Nebular hypothesis] 



Bredichin, T. : Spectre des nebuleuses. Mem. Soc. Spet. Ital., Nov., 1875, 

 p. 109. [Contains an examination of the spectra of the follow- 

 . ing planetary nebula? : G. C. 4964, 4628, 4234, 4447, 4390, 4510, 

 4373. The spectra of all these are nearly identical. G. C. 4244 

 gives a stellar spectrum; G. C. 4532 [dumb -bell,] 4373, and 

 4572 also examined.] 



: Spectre des nebuleuses. Annates de VObservatoire de Moscou, ii, 



[2me liv.,] p. 60. [Spectra of the nebula? G. C. Nos. 4964. 

 4628, 4234, 4447, 4390, 4510, 4373. The mean spectrum of 

 planetary nebula? is A = 5003.9 ± 1.2; B = 4957.9 =b 11.4 ; C 

 = 4859.2 ± 3.1 ; wave lengths.] 



: Observations des nebuleuses. Same vol., p. 114. [Positions of 



nebula? by Bredichin and Schweizer in 1862-5 and 1875. 

 New nebula, 1876-0 a == 23 h 54 m 50 9 rf + 7° 3'.0. Measures 

 of G. C. 4532 [dumb-bell,] 4702, 116, 117, 307, 575, 600, Nova, 

 1225, 1949, 1950, 2203-7, 2946, 3035, 3453, 4234, 4244, 4294, 

 4373, 4390, 4447, 4510, 4572, 4580, 4627, 4628, 4670, 4078, 4760, 

 4964, 5040.] 



: Tempel's variable nebula in the Pleiades. Same vol., p. 125. 



Breen : A. N., xliii, col. 246. [Discovery of a nebula.] 



49 



