83 Mr. Herschel’s Catalogue 
Ilf, fo call It, probably tinges them too deeply. Diftance 
with 278, 12 77 34 /7/ ; with 625, 12" 23'". Pofition 
50° 1 2 / 11. preceding. 
104. Fl. 83*™ Herculis praecedens. 
Mar. 26, Double. About 4 degree preceding the 83 ; the fe- 
,783. cond fhr towards the 79th Herculis. Very unequal. 
L. r. ; S. darker r. Diftance 14" 20 /7/ . Pofition 83° 
48 7 n. preceding. 
105. y (Fl. 12 3 ) Sagittae borealior et praecedens. 
April 7, Double. About 2 7 preceding the double ftar V. 106. 
,1782. Pretty unequal. L. r. ; S. d. Diftance i4 // 29 /// ; 
very inaccurate, oil account of obfcurity. Pofition 
50° 24' f. preceding. 
ro6. Fl. 5 Serpentis. 
May 21, Double. Exceffively unequal. L. rw. ; S. db. Too 
1783. obfcure for meafures. Of the third clafs, far. Pofi- 
fition about 30° or 40° 11. following. 
107. Congerie Stellularum Sagittarii borealior. 
June 6, Double. Above i| degree n. of the 20th clufter of 
I7 go. ftars of the Connoijj'ance des Temps> in a line parallel 
to y Sagittarii and the clufter : the moft fouth of many. 
Confiderably unequal. Diftance with 278, 15" io 77/ . 
As accurate as the prifmatic power of the atmofphere, 
which lengthens the ftars, will permit. Pofition 54° 
4§ 7 f. preceding 
x o 8 . 
* What I call the prifmatic power of the atmofphere, of which little notice 
has been taken by aftronomers, is that part of its refractive quality whereby it 
difperfes the rays of light, and gives a lengthened and coloured image of a lucid 
point. It is very viftble in low ftars j Fomalhand, forinftance, affords a beau- 
tiful prifmatic fpeCtrum. That this power ought not to be overlooked in delicate 
. arid 
4 
