■ of Dvnbh Stars, 45 
All the obiervations in the Allowing catalogue on the rela- 
tive magnitude, colour, and politico of the if a is, are to be 
underflood as having been made with a power of 460, unlefs 
they are marked other wife. This will account for the dif- 
ference which obfervers may find in the relative magnitude ; for 1 
Ihould they ufe only a power of about 200, many of the 
finall flars that are faidto be very unequal and extremely une- 
qual, muff appear to them perhaps a degree lower in the fcale, 
and become extremely and exceffively unequal ; and this will 
happen, though the quantity of light fhould be the very fame 
which the refledtor has that fereed me to fettle thefe particulars. 
I need not fay, that on other accounts, fuch as a real difference,, 
in the light of the telefcope, the prefence of the moon, twi- 
lights, aurorae boreales, or other caufes, many of the fmall 
liars, may be found to be of a different comparative luflre from 
what is affigned to them in the catalogue. The fmall liar near 
Rigel, for inltance, appears of a beautiful pale red colour, full, 
round, and well defined, with my 20-feet refledtor the 10 -feet 
inflrument Ihews it alfo very well in fine evenings ; the --feet 
requires more attention, nor is the fmall flar defined, but of a 
dufky pale red colour. A good feet achromatic, of a large 
aperture, when Rigel is on the meridian, may, perhaps, alfo 
Ihew the fmall liar,, although I have not been able to fee it 
with a very good inflrument of that fort, which fliews the 
Imall liar that accompanies the pole-liar ; but the evening was 
not very favourable. 
The meafures of the dilfances were all taken with a parallel 
lilk- worm’s- thread micrometer, and a power of 227 only. 
They are not, as in the former catalogue, with the diameters 
kicludedj but from the center of one liar to the center of the 
