ConJlruSilon 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 lail; numbers. The calcula- 

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

 table, are founded, the firfl, on a fuppoiition of the flars '• 

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

 allowed them; the next affigning them only lialf a fecond 

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

 very different accumulation of ftars may take place in different 

 nebulas ; by which means fome of them may ail^ume the milky 

 appearance, though not near fo far removed from us ; w^hile 

 clufters of ftars alfo may become refolvable nebulae from the 

 fame caufe. The dlftindnefs of the inftrument 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. ' 



Kk2 TABLE 



