VARIOUS NEBUL/E. 



cation of the higher powers used by Lord Rosse, and consequently 

 Sir John Herschel's theoretical speculations based upon this parti- 

 cular form, must be regarded as losing much of their force, if not 

 wholly inadmissible ; and this is an example proving how unsafe 

 it is to draw any theoretical inferences from apparent peculiarities 

 of form or structure in these objects, which may be only the 

 effect of the imperfect impressions we receive of them, and which, 

 consequently, disappear when higher telescopic powers are applied. 

 The case of the nebula represented in figs. 31 and 32, presents 

 another striking example of the force of these observations. 



88. In fig. 40 is a nebula drawn by Sir J. Herschel, who 

 describes it as a faint large round nebula, which, by attentive 

 examination, may be seen to be composed of excessively minute 

 stars, appearing like points rubbed out. It is, in fact, a globular 

 cluster. 



In fig. 41, is a nebula situated in E A 22 n 56 m , N r D 78 36', 

 and therefore in the southern part of the constellation of Pegasus. 

 The length of this, as estimated by Sir J. Herschel, is 2', or the 

 loth part of the moon's diameter, while the breadth is only half a 

 minute, or the 60th part of the breadth of the lunar disk. It 

 is shown in fig. 41 as it appeared in the telescope of Sir .1. 

 Herschel. It is described by him as pretty bright and resolvable, 

 and extended between two small stars, having two very small 

 stars visible in it. 



In fig. 42 is shown' the same object as seen in Lord Rosse' s 

 telescope. It was frequently observed, both by Lord Rosse him- 

 self and several of his friends, and the drawing represents the 

 form with great accuracy. It was doubtful whether the form 

 was strictly spiral, or whether it were not more properly annular. 



In fig. 43 is shown a double nebula situate in E A 7 h 15 m , 

 N p D 60 11', and therefore near the bright star Castor. It is 

 drawn by Sir J. Herschel, who describes it as a curious bright 

 double or an elongated bicentral nebula. 



In fig. 44 is the same object as shown by Lord Rosse's 

 telescope on 22nd December, 1848. A bright star was visible 

 between the nebulae from which tails and curved filaments 

 issued. The existence of an annulus surrounding the two nebulae 

 was suspected. 



In figs. 45, 46 are views of the same nebula, as seen by Sir 

 J. Herschel and Lord Rosse. This object is situate in E A ll h 10. 

 x P D 75 59', and therefore between the two brightest stars of the 

 constellation Leo. Its length is 4' or about the 7th of the moon's 

 diameter. It is described by Sir John Herschel as large, elliptical 

 in form, with a round nucleus, and growing gradually brighter 

 towards the middle. 



39 



