2;;o Mr, Herschel on the 



other, yet we allow that fome fuch conjun£lions really are to 

 be found ; nor is this what we mean to exclude. But then 

 thefe compound or double nebul'je, which are thofe of the third 

 raid fourth forms, ftill make a detached link in the great chain. 

 It is alio to be luppolcd, that there may ll:iil be fome thinly 

 fcattered folitary ftars between the large interfaces of nebulae, 

 which, being iituated fo as to be nearly equally attrad^ed by the 

 feveral clufters when they were forming, remain unaffociated. 

 And though we cannot expe£l to fee thefe ftars, on account of 

 their vafl diftance, yet we may well prefume, that their num- 

 ber cannot be very conliderable in comparifon to thofe that are 

 already drawn into fyftems ; which conje6lure is alio abun- 

 dantly confirmed in fituations where the nebulae are near enough 

 to have their ftars vlfible ; for they are all inlulated, and gene- 

 rally to be feen upon a very clear and pure ground, without 

 any flar near them that might be fuppofed to belong to them. 

 And though I have often feen them in beds of ffcars, yet from 

 the fize of thefe latter we may be certain, that they were 

 much nearer to us than thofe nebulas, and belonged undoubtedly 

 to our own fyflem^ 



Ufe of the gages, 



A delineation of our nebula, by an application of the gages 

 in the manner which has been propofed to be done in my for- 

 mer paper, may now be attempted, and the following table is 

 calculated for this purpofe. It gives us the length of the vifual 

 ray for any number of flars in the field of view contained In 

 the third column of the foregoing table of gages from ^^ to 

 looooo. If the number required is not to be found in the firft 

 4 , column 



