338 JOHN TEBBUTT. 
with a faint nebulous haze. As this was doubtless the comet 
centraily superposed on the star, I made four comparisons of 
this star with my comparison star of the preceding evening. 
The resulting position agrees to a minute of arc with that given 
in the ephemeris. Clouds prevented further comparisons so that 
I was unable to witness the subsequent separation of the comet 
from the star. No micrometric measures could be made of the 
diameter of the comet, but it could not certainly be less than 15”. 
Now as the distance of the comet from the earth at the time of — 
observation was fifty-seven millions of miles, fifteen seconds of arc 
would give a globular volume of cometary matter with a diameter 
of about four thousand miles, and yet the star was well seen 
centrally through this mass. I may add that there is at least one 
instance on record in which the lustre of a fixed star has been 
increased by being viewed through the head of a comet, and there 
is yet another in which a star has been almost wholly obscured. 
COMET II. (WOLF) 1891. 
a Parallax | Reductions | 4 
Windsor Comet—Star. S| Comet’s Apparent. | Corrections of & 
5 in ‘Star Places.|2 
Date. | Mean cS Per eee 
Time. | Ax Ad |& x 6 x O\-| ve 6 8 ; 
iS) aut DO . 
5 || ln, te, Sh | ttl Se Y ag h.m. s. OO ah! S. uw s. u 
GEES 13 44 48/45 1°50| — 2 46°6 |10} 4 34 43°69 |+ 9 53 38°3 | —0°25) —7°2 | +2°34) +13°8] 1 
11/15 56 46 | —4 32°25| — 2 11°6/ 5) 4 86 18°92 |+ 8 47 13°3 | +0711) —7°2 | +2°34| +13°7| 2 
” 31115 56 46| —8 2417 | + 4 13°3| 5| 4 36 15°36 |+ 8 47 11°3|+0-11|—7-2 | +2°32] +13°6| 3 
” 39111 31 39| +7 5:64| — 6 59-0 |10| 4.41 23°16 |— 1 22 44-3 | —0-39| —5-9 | +2°71| 415-4] 4 
> 31/11 2 20| —7 30°78) + 0 55-9| 7) 4 41 13°65 |— 1 53 24 |—0-44| 5:9 | +269] +149] 5 
* 31/11 2 20|—-75450/+ 5 18] 7/4 41 13°31 |— 153 27 |—0-44/—5-9 | +2-69| +149] 6 
Nov. 2/11 29 0| +8 29:78|— 3 2:9] 7] 4 40 4672 |— 2 54 42°8 | 0-36] —5°7 | +2°77| +15-4| 7 
3» 2(1l 29 0] +0 5252/- 2287) 7) .. ... | .. |. | =0°36)—5°7 | +2°75) +152) 8 
* 3/10 42 38| +1 49°09 | — 1 27°5|10) 4 40 30°91 |— 3 23 257 | —0-45|-5°7 | +2°77/ +15'2| 9 
3/10 42 38| +0 25°37) + 3 36-6 |10| 4 40 31°22 |— 3 23 25-7 | —0-45|—5°7 | +2-76| +15°2)10 
* 4/10 24 0/—03896/+ 0568/8) .. ... |... wu. |—0°47/—5°6 | 42°78) +15°1/11 
4/10 24 0] —5 54°65 | — 2 21°5| 8] 4 40 13-04 |— 3 52 47°8 | —0°47| —5°6 | +2°76| +14-912 
” gli 38 6|—4 48°97}— 9 29°2)10) .. ... |... | —0°29)—5°2 | +2°82| +14°8113 
Dee.17| 9 14 50| +3 12'43/ + 3 57:0] 5| 4.16 29°39 |—14 50 12-2 | —0°16) —2°8 | +3°22/+ 9°1/14 
sw 17| 9 14 50| +1 33°52] + 0 514) 5) 416 29°32 —14 50 15°7 | —0°16] —2°8 | +3°22) + 91/15 
* 90| 9 20 53| +2 18°45) + 3 19:2] 6] 415 35:41 |—14 50 50°%5 | -0-12|—2°7 | +3°22/+ 86/14 
» 21] 8 5811/+2 407/+ 4 69) 4 4 15 21:03 |—14 50 3:0 | —0°16| —2°7 | +3°22) + 8°4/14 
»» 25| 9 22 20) —O 18°75 | + 8 45:4 /10| 4 14 37°05 |—14 42 23-1 | —0°07/ —2°5 | + 3°22) + 7°7/15 
» 26} 9 10 42| —O 24°57 | +11 40°5 |10) 4 14 31°23 —14 39 28:2 : 5 | +3°22! + 7°5/15 
