324 



Mr, W. Lassell on the Great Nebula in Orion, [Apr. 23^ 



of the more interesting stars. The fifth star of the trapezium is reddish, 

 and has a pretty hroad and not very brilHant disk, — much larger than that 

 of the sixth, which is more brilHant, and whiter. Yet the first impression 

 of the fifth on the eye is more forcible than that of the sixth. 



Adopting Herschel's numbers, 57 is much less bright than 51. The 

 star marked II is nearly as bright as 57 ; but the two stars south-following 

 II are the smallest points visible. 



Of the delicate pair preceding B of the trapezium, the following star is 

 the brightest. 



The minute stars preceding and north-following 93, were undoubtedly 

 verified ; but there seemed a want of precision in the image of the latter 

 (if one may so speak of such a faint thing) which suggested the idea of 

 its being double. 



Herschel's 78, 82, and 91 have on no occasion been recognized; a star, 

 however, has been seen as laid down in the drawing, a very little south- 

 following the place of 78. 



In the drawing, Herschel's numbers are adopted throughout ; and for 

 convenience of reference and identification, they are attached in minute 

 figures to each star. Its scale, as given at the foot, is 100"= 1*194 inch. 

 All the stars which have been certainly and repeatedly seen are inserted, 

 and, I believe, no others. Some attempt at indication of respective 

 magnitude has been made in depicting the stars, but their estimated 

 magnitudes are more precisely given in the margins, right and left of the 

 picture. They are, however, more fully laid down in the following Cata- 

 logue of the stars contained in the map, the places being principally taken 

 from Liaponov's measures. A good many of the stars, however, I have 

 independently measured, and though my means for this especial purpose 

 were probably inferior to those of M. Liaponov, I have added a list of my 

 measures for comparison or identification. 



W. Lassell. 



Kay Lodge, April 1868. 



