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XIL Catalogue of Double Stars . By Mr. Herfchel, F. R. & 
communicated by Dr. Watfon, Jun. 
Read January io, 1782. 
INTRODUCTORY REMARKS. 
following catalogue contains not only double-liars, 
I but alfo thole that are treble, double-double, quadruple, 
double-treble, and multiple. The particulars I have given of 
them are comprehended under the following general heads. 
I. The names of the liars and number in flamstead’s 
Catalogue ; or, if not contained therein, fuch a defcription of 
their fituation as will be found lufficient to point them out. 
II. The comparative fize of the liars. On this occalion I 
have ufed the terms equal, a little unequal, pretty unequal, 
confiderably unequal, very unequal, extremely unequal, and 
exccffively unequal, as exprefling the different gradations to 
which I have endeavoured to affix always the fame meaning. 
III. The colours of the liars as they appeared to me when I 
viewed them. Here I mull remark, that different eyes may per- 
haps differ a little in their eflimations. I have, for inftance, found, 
that the little flar which is near a Herculis, by fome to whom 
1 have (hewn it has been called green, and by others blue. Nor 
will this appear extraordinary when we recoiled! that there are 
blues and greens which are very often, particularly by candle- 
light, miftaken for each other. The fituation will alfo affect 
the 
