j 4$ Mr. herschel’s Catalogue 
leave a very well-defined circular difk for the apparent 
diameter of the {tars. The diameter of a Lyras, by 
this attention, appeared perfectly round, and occa- 
fionally feparated from rays that were flafhing about 
it. From the very brilliant appearance of the ftar 
with this great power, and a pretty accurate rough 
calculation founded on its apparent brightnefs, when 
obferved with the naked eye with 22 7, with 460, 
with 6450, I furmife, that it has light enough to 
bear being magnified at lead; a hundred thoufand 
times with no more than fix inches of aperture, pro- 
vided we could have fuch a power, and other confi- 
derations would allow us to apply it. When I had as 
good a view as I expected to have, 1 took its diameter 
with my new micrometer upon a fcale of eight inches 
and 4428 ten thoufandth to 1" of a degree, and found 
it fubtended an angle of c/ / ) 3553* I had no perfon 
at the clock ; but fuppofe the time of its pafling 
through the field of my telefcope (which in this 
great power is purpofely left undefined, and as large 
as poftible) was lefs than three feconds. 
40. v Lyras, fl. 8. 
Sept.24, Treble. Extremely unequal. L. w. ; S. both d. 
* 7 81 * One n. preceding, the other f. following. Diftance 
of the following ftar 56" 4 y"\ a little inaccurate. 
Pofition of the fame 28° 27' f. following. 
41 . A Perfei, fl. 43. 
Sepr.24. Double. Unequal. L. w. Diftance about 5o ,/ . 
42. In conftellatione Lyrae. 
Sept. 25, Double. It is a fmall ftar juft by rj, A little un- 
equal 
