346 E. 8. Holden — On supposed changes in Nebula M. 17. 



8) towards the n. p. much farther than in Herschel's drawing." 

 (our fig. 1.) 



'■'■Nearly certain: — 1. The bright branch is more definitely 

 bounded on its southern side than upon the northern. [??] 



2. The ' resolvable knot' of Herschel has either a second 

 nucleus or involves a faint star in its [south] margin." 



^'' Strongly suspected : — 5. Just [south] of star [2] is a portion 

 a little brighter than the rest of the bend." 



Mason's star positions are given in Table I. 



Lassell gives no description of the nebula, and we extract 

 onlj his measures of the co-ordinates of eleven of the brightest 

 stars, which are contained in Table IV, and which we shall use 

 as standard positions to which all others are to be referred. 



We give Lassell's figure above, remarking that it was ( 

 structed, as indeed all the preceding ones have been, by 

 measuring the relative position of the brighter stars, then ins 

 ing by careful eye-estimates the fainter ones, and finally 

 drawing among these stars, guided by their configurations, 

 'Ictails of the nebula itself. 



