466 Dr. Bersch&l’s Catalogue of One Thoifand 
the fimilar condition of other planets fupport the dodlrine of 
the diurnal motion, the view of fo many fidereal fyftem s* feme 
of which we may difeern to he of a moft furprifing extent and 
grandeur, will in like manner add credit to what I have pro- 
poked with regard to the condition of our fituation within a 
• fyftem of ftars : for, to the inhabitants of the nebulae of the pre- 
fect catalogue, our fidereal fyftem rnuft appear either as a fmali 
nebulous patch; an extended ftreak of milky light; a large 
refolvable nebula ; a very comprefled clufter of minute ftars 
hardly difeern ibie ; or as an immenfe collection of large fcattered 
ftars of various ftzes. And either of thefe appearances will 
take place with them according as their own fituation is more 
or lefs remote from ours. 
In the diftribution of the nebulae and clufters of ftars into 
dalles, I have partly .con'fide red the convenience of other ob- 
fervers : thus, in the firft clafs, the degree of brightnefs of the 
nebulae has been the leading feature, as moft likely to point 
out thofe which their feveral inftruments may give them ex- 
pectation to reach. The firft clafs, therefore, contains the 
brighteft of them; thefecond, thofe that fhine but with a feeble 
light ; and in the third are placed all the very faint ones. Be- 
iides this general divifion, I have added a fourth and a fifth 
clafs, which contain nebulas that, on different accounts, feemed 
to deferve a more particular defeription than I had allotted to 
the three former divifions. 
The clufters of ftars are forted by their apparent compreftion, 
in the manner of my former Catalogues of double, treble, and 
multiple ftars; fo that the clofeft and richeft clufters take up 
the firft clafs ; the brighteft, largeft, and pretty much com- 
preffed ones, the fecond ; and thofe, which confift only of fcat- 
tered and lefs collected large ftars, are put into the laft. 
In 
