ConJlrudUon of the Heavens, 251 
column of this table, a proportional mean may be taken be- 
tween the two neared rays in the fecond column, without any 
material error, except in the few lalh numbers. The calcula- 
tions of refolvable and milky nebulolity, at the end of the 
table, are founded, the firft, on a fuppofition of the liars 
being fo crowded as to have only a fquare fecond of fpace 
allowed them; the next affigning them only half a fecond 
fquare. However, we fhould confder that in all probability a 
very different accumulation of fiars may take place in different 
nebulae ; by which means fome of them may affume the milky 
appearance, though not near fo far removed from us ; while 
duffers of ftars alfo may become refolvable nebulae from the 
fame caufe. The diffindnefs of the inffrument 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 
t ABL E 
