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Two observations have been excluded: one because the Star's entry was marked somewhat too late; the other, because the telescope received a slight blow during the observation which may have displaced it. Both of these on being reduced agree well, but I have thought it safer to reject them.

The Star is in the Mémoires de l'Académie for 1790, p. 383, A. Transit at 12". 39". 35",0.

OCT. 18.
Watch fast 8". 0.

Ingress. Egress.
h. wn. &. h. 77t. &.
Comet 7.48. 39,2 7. 50. 52,8
Star 52 . 48,4 53. 56,6
Comet 55. 8,4 57. 19,6 Inner Ring.
Star 59. 1,6 8 - 0. 29.6\ Star in the upper half
of the field:
Comet 8. 1. 42,6 * : *"I Comet in the lower.
Star 5. 37,8 7. 11,2
Comet 39. 20,8 41 . 13,2
Star 42. 16,2 44. 55,0/

The Star is in Histoire Céleste, p. 83, there called, but erroneously, 46 Herculis.

Wol. VI. PART III. 3 S

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Ingress. Egress.
h. 7n. &. h. on. ar.

Comet 7. 5. 20,4 7. 7. 31,2

Star 5. 24,4 8. 11,2

Comet 9. 0,4 10. 58,0

Star 8. 56,8 11 . 41,6
Comet 16. 20,0 18 . 16, B o *

th in the same half
Star 16. 8.0 18. 50.8 s “”
> 2 of the field.

Comet 25. 38,8 27. 17,2

Star 25. 22,0 28. 6,6
Comet 31. 35,8 32. 52,6

Star 30. 58,2 33. 35,8

The Star is Ophiuchi.

OCT. 23.
Watch slow 1". 3".

Ingress. Egress.
h. m. s. h. m. s. Inner Ring.
Star 6. 24. 14,8 6. 26. : Both in the same half
Comet 24. 27,6 25. 2,8 of the field.

I have been unable to find this Star in the Catalogues.

OCT. 27.
Watch slow 2". 36.

Ingress. Egress.
h. m. or. h. m. &.
Star 6. 18. 33,2 6.19.462
Comet 19. 7,8 21. 12,0
Star 23. 58,6 25. 21,6
Comet 24. 42,8 26.41,6
Star 27. 59,4 39.70 |s o: Ring. l
In :
Comet 28. 33,2 30. 41,2 } Star in the upper half
Comet in the lower.
Star 32. 59,0 34. 15,8
Comet 33. 37,4 35.45,4
Star 35. 55,8 38. 18,2
Comet 37. 34,6 39. 41,6 J

The Star is in Histoire Céleste, p. 290, B. Transit at 17*. 8". 32.

To reduce these observations, it is necessary to allow for the differences of refraction in right ascension and declination, and also for the proper motion of the Comet. This proper motion was obtained, wherever it was possible, from the observations themselves: where this could not be done, as in the case of single observations, I made use of Mr Stratford's Ephemeris.

APPARENT PLACES OF THE STARS OF COMPARISON FOR THE RESPECTIVE TIMES OF OBSERVATION.

Date. Name of Star. Roon. Declination. Authority. h. m. &. o w w

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22 z Aurigae . . . . . . . . . . . . . . . . . . . . 6. 17. 59,3| + 30.35. 19 || AR. Airy. Dec. Piazzi.

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6. 22. 53,8 + 33. 8. 11 Po of two observations,

Star. . . . . . . . . . . . . . . . . . . . . 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30(a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . - (b) 61 Aurigae. . . . . . . . . . . . . . . . . . 6.42. 39,7| + 38.41.55 || Piazzi v1. 252. Oct. 2 Hist. Cél., p. 208. A. - Hist. Cél., middle and 3d .*.*.*...) 6. 52.29,8 + 40.48. 46 { wires.

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5 Hist. Cél., p. 377. B. - Hist. Cél., observed at .*.*.*..) 7. 22. 21,3 + 48. 32.17 three wires. 7 Piazzi viii. 15. . . . . . . . . . . . . . 8. 5. 32,6| + 54. 38.45 || Piazzi. 10 AR. = 10h. 48m.58%. 4 ) for Groombridge, unpublishN.P.D. = 250 oło, 10. 50. 37,1 + 64. 18. 12 { ed Catalogue.

11 Mém. de l'Acad. for 1790.
| 12.41. 24,3 || 4-61. 12.48 Observed at three wires.

transit at 12" . 39" .. 35",
p. 333. A. . . . . . . . . . . . . . . . .

- o - Observed at middle and 18 Hist. Cél., 46 Herculis....... 16.41 . 57,3 + 13. 34.42 { 3d wires.

19 * Ophiuchi ................... 16.46. 12,7| + 10. 26.38 Pond, Catalogue for 1830. 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .

- - - - - - - • * * * * * * * * * * * * * * * *

Observed at 1st and mid

27 Hist. Cél., p. 290. B.
} dle wires.

transit at 17*. 8". 32°. 17. 11. 9,6 || – 5.43. 52 {

The reduction of these observations, allowing for the watch error, gives:–

Aa Að
h. na. s. ht. &. r -
Sept. 20. 11. 37. 36 + 1 . 3,5 + 4.36
51 .. 48 1. 6,5 1 .. 34
22. 13. 54. 17 — 1 . 44,7 + 34. 12
59. 18 1. 43,9 34. 43
14, . 12. 51 1. 42,5 35. 5
25. 10.46. 16 - 25,3 — 5. 19
11 . 1 .45 27, 1 5. 1
7. 14 26,3 4. 54
28. 11 . 21. 17 + 48,5 – 25 - 2
30. 10. 47. 6 + 1 . 1,3 + 2.49
51 .. 52 1. 3,0 6. 5) (a.)
57. 1 1. 8,0 4. 44
11 . 14, . 12 – 3. 1,3 — 34.59
20. 41 2. 59,5 35.26 ) (b.)
26. 16 2. 59,4 35. 13
Oct. 2. 12. 8. 57 — 39,3 + 31 . 59
13. 51 40,8 32. 58
18. 40 44,6 33. 20
4. 10. 56. 24 + 2,0 — 1 .. 33
11. O. 56 0,9 5. 31
21 .. 2 5,4 12. 4
26. 24 7,7 0.26
47. 9 8, 1 11. 16
5. 11 . 13 . 53 + 14,8 – 26. 30
7. 11. 15. 16 + 27,7 + 3.25

20. 15 30,1 3.17

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