266 ; The Great Comet of 1861. 
The following is the list of observations, as far as reduced and 
compared with the above elements: 
Wash. M. T. a c.—o. é C.—0. 
° ts Us if 3° rs af ai 
July 241250 130 48 68 + 24 63 12 485 + 13 
336480 147 56 52:0 +179 66 — 06 
88102 148 14 43:1 — 95 66 11 49:9 -— 47 
63908 152 88 +24°8 66 34 176 — 25 
436786 164 40 268 +186 66 54 21-2 — 55 
637421 187 49 03 + 25 6451 17 — 58 
836769 200 12 23°3 oR a 6150 20 — 08 
10 53104 746 02 en 58 58 55°8 _ 
1145260 209 59 30 28 57 56 582 —10°2 
12-42192 21154 91 + 89 56 58 121 7 
1443062 214 56 37°2 + 75 55 14 25°56 ~ 6 
16 37969 96 —13°4 352 5 + 52 
17°35071 217 58 33:0 — 48 58 16 87°0 + 15 
4215 58:8 + 42 53 14137 — 38 
2040982 220 9540 +167 51 42 285 — 38 
23 37224 221 44 40°7 +195 50 80 17:2 — 91 
24 35193 222 11 27°8 +-28'1 9 26°8 — 98 
25 36487 222 37 26-0 +3825 49 49 15:3 —132 
27:37080 223 24 38°3 +360 49 12 25°8 
From these residuals it is evident that the orbit requires yet 
some correction, not sufficient, however, it is believed, to change 
its decided hyperbolic nature. 
6. Elements of the Comet, in a letter to the Editors, by Mr. M. C. STEVENS. 
I took the position of the late great comet on the 4th, 8th and 
12th ult., at our Observatory with the following results: 
Mean time of Observation. Geocentric Long. of Geocentric Lat. of 
° Migs} PB BOTEES « 
July 4.39260 129 31 32 53 25 51 
“* 8.40480 155 48 12 60 55 24 
“ 12.387426 171 81 42 62274 
From these I have computed the following elements of its 
orbit :— 
Uj 
Long. of ascending node, ofg 57 52 
Inclination of orbit, 85 38 75 
ng. of perihelion, “) 948 +80 (88 
Perihelion distance. Log. 9°91248 
Peribelion passage, 1861, June 11.12177. Washington M. T. 
Motion direct. 
Haverford Observatory, West Haverford, Pa., 8th mo. 15th, 1861. 
