2^o Mr. Herschel on the 



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

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

 thefe .compound or double nebulae, which are thofe of the third 

 and fourth forms, flill make a detached link in the great chain. 

 It is alfo to he fuppofed, that there may fti!l be fome thinly 

 fcattered folitarv flars between the lar^e interftlces of nebulse, 

 which, beuig fituated fo as to be nearly equally 2ttYd.0:ed. by the 

 feverai clufters when they were forming, remain unaffociated. 

 And though we cannot expect- to fee thele ftars, on account of 

 their vaft diftance, yet we may well prefum.e, that their num- 

 ber cannot be very contiderable in com-parifon to thofe that are 

 already drawn into fyflems ; which conjetlure is alfo abun- 

 dantly confirmed in fituatlons where the nebulas are near enough 

 to have their flars vifible ; for they are all infulated, and gene- 

 rally to be i'een upon a very clear and pure ground, without 

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

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

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

 much nearer to us than thofe nebulae, and belonged undoubtedly 

 to our own fyftem. 



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 ftars in the field of view contained in 

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

 100000. If tlie number required is not to be found in the iirft 

 4 column 



