2,8 Mr. Herschel on the 
thofe of the third at treble the diftance, and fo forth. It is not 
neceffary critically to examine what quantity of light or mag- 
nitude of a ftar in titles it to be eftimated of fuch or fuch a pro- 
portional diftance, as the common coarfe eftimation will anfwer 
our prefent pnrpofe as well; taking it then for granted, that a 
ftar of the feventh magnitude is about feven times as far as 
one of the firft, it follows, that an obferver, who is inclofed 
in a globular clufter of ftars, and not far from the center, will 
llever be able, with the naked eye, to fee to the end of it : for, 
iince, according to the above eftimations, he can only extend his 
view to about feven times the diftance of Sirius, it cannot be 
expedled that his eyes fhould reach the borders of a clufter 
which has perhaps not lefs than fifty ftars in depth every where 
around him. The whole univerfe, therefore, to him will be 
comprifed in a fet of conftellations, richly ornamented with 
fcattered ftars of all fizes. Or if the united brightnefs of a 
neighbouring clufter of ftars fhould, in a remarkable clear 
night, reach his fight, it will put on the appearance of a fmall, 
faint, whitifh, nebulous cloud, not to be perceived without 
the greateft attention. To pafs by other fituations, let him 
be placed in a much extended ftratum, or branching clufter of 
millions of ftars, fuch as may fall under the III d form of ne- 
bulas confidered in a foregoing paragraph. Here alfo the hea- 
vens will not only be richly fcattered over with brilliant con- 
ftellations, but a fhining zone or milky way will be perceived 
to furround the whole fphere of the heavens, owing to the 
combined light of thofe ftars which are too fmall, that is, too 
remote to be feen. Our obferver’s fight will be fo confined, 
that he will imagine this fingle colleftion of ftars, of which he 
does not even perceive the thoufandth part, to be the whole 
contents of the heavens. Allowing him now the ufe of a 
4 common 
