ConJlru6lion of the Heavens, 251 



column of this table, a proportional mean may be taken be- 

 tween the two neareft rays in the fecond column, without any 

 material error, except in the few laft numbers. The calcula- 

 tions of refolvable and milky nebulofity, at the end of the 

 table, are founded, the firft, on a fuppofition of the ftars 

 being fo crowded as to have only a fquare fecond of fpace 

 allowed them; the next afligning them only half a fecond 

 fquare. However, we (hould confider that in all probability a 

 very different accumulation of flars may take place in different 

 nebulae ; by which means fome of them may aflume the milky 

 appearance, though not near fo far removed from us ; while 

 clufters of ffars alfo may become refolvable nebulas from the 

 fame caufe. The diflindnefs of the inflrument is here alfo 

 concerned ; and as telefcopes with large apertures are not eafily 

 brought to a good figure, nebulous appearances of both forts 

 may probably come on much before the diflance annexed to 

 them in the table. 



K k 2 TABLE 



