Mr. herschul's Catalogue 
mayor's purjiofe.; therefore I examined the heim ns with 
much higher powers, and looked out chiefly for luch as were 
exceedingly clofe. 
The above catalogue contains 269 double Stars, 227 of 
which, to my prelent knowledge, have not been noticed by 
any perfoti. I hope they will prove no inconsiderable addition to 
the general frock, eipeciallv as in that number there are a great 
many which are out of the reach of Mr. mayerY and other 
mural quadrant or traniit instruments. It can hardly he ex- 
pected, that a power of 70 or 80 would he lufficient to dis- 
cover thole curious Stars that are contained in the SirSt clafs of 
mv catalogue ; So that it is not Strange they Should have in- 
tirely efcaped Mr. mayer’s notice. We fee that it is not for 
want of his looking at thofe Stars ; for we find he has fre- 
quently ohferved £ Cancri, the Star near Procyon, and the Star 
in Monoceros, without perceiving the fmall Stars near them, 
which 1 have pointed out. Nor is it only in the firlt clals 
that his telefcope wanted power, light, and diitindtnefs ; 
for the fmall Stars that are near /3 Orionis, Q. Serpen tis, 
q Orionis, e Pegafi, a Lyrae, a Andromeda?, ^ Sagittarii, a 
Aquilae, 7j Pegali, 2 Lyrae, 1 Libra!, x Pifcium, « Tauri, and 
many more, have efcaped his difcovery, though he has given 
us the places of other more distant fmall Stars not far from 
them, and therefore mult have had them frequently in the 
held of view of his telefcope. I11 fettling the relative fit na- 
tions of very clofe double Stars, neither Mr. mayer s instru- 
ments, nor his method, were adequate to the purpofe. It is 
well known, that whenever we employ time as a meaiure, the 
reiults cannot be very accurate ; becaufe a mistake ot no more 
than a tenth part of a iecond in time will produce an error of 
a whole fecond and an half in meafure, lo that his AR mult 
; z : ' he 
