2$o Mr. Hersciiel on the 
other, yet we allow that fome fuch conjunctions really are to 
be found; nor is this 7 what we mean to exclude. But then 
thefe compound or double nebulae, which are thofe of the third 
and fourth forms, ftill make a detached link in the great chaim 
It is alfo to be fuppofed, that there may ftill be fome thinly 
fcattered folitary Bars between the large interfaces of nebulae, 
which, being htuated fo as to be nearly equally attracted by the- 
feveral clufters when they were forming, remain unaffociated. 
And though we cannot expeft to fee thefe ffcars, on account of 
their vaft diftance, yet we may well prefume, that their num- 
ber cannot be very considerable in comparison to thofe that are 
already drawn into fyftems ; which conjecture is alfo abun- 
dantly confirmed in Situations where the nebulae are near enough 
to have their ffars vifible ; for they are all infulated, and gene- 
rally to be feen upon a very clear and pure ground, without 
any ffar near them that might be fuppofed to belong to them. 
And though I have often feen them in beds of ffars, 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. 
Ufe of the gorges. 
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 Bars in the held of view contained in 
the third column of the foregoing table of gages from ^ to 
xooooo. If the number required is not to be found in the firft 
x A column 
