364. A return of Pons's comet of 1812.

365. An elliptic orbit; period assigned, 5.36 years.

366. An elliptic orbit; period assigned, 6.764 years.

367. A return of Encke's comet.

368. Perihelion distance greater than that of any other comet save 1729.

370. A return of Tuttle's comet (1858, i).

372. At the end of April it reached mag. 2, and had a tail 4° long.

373. It had a tail 3° long. Elements resemble those of the comet of 1785 (ii). 375. An elliptic orbit; period assigned, 6.30 years.

377. A return of Winnecke's comet. (Theoretical elements.)

378. An elliptic orbit; period assigned, 6.67 years.

380. Visible to the naked eye as a star of mag. 2, with a tail 5° long, besides 2 secondary tails.

382. Probably an elliptic comet of long period.

385. A return of Olbers's comet of 1815.

386. It had a tail which on April II was 5° long. An elliptic orbit: period

assigned 1615 years.

387. An apparition of Encke's comet.

Nn

A SUMMARY OF THE PRECEDING CATALOGUEa.

FROM

ROM an examination of the Catalogue just given we may obtain certain results which will here be analysed.

It appears that 394 comet apparitions have been subjected to mathematical investigation, viz. :—

Known periodical comets

Subsequent returns

23

81

Elliptic comets not yet verified, and parabolic comets 284
Hyperbolic comets

6

394

Of known periodical comets, we have the following, as the number of the apparitions of each :

961: 1097: 1231: 1264: 1362i: 1532: 1596: 1678: 1699i: 1790 iii: 1810: 1812.

Elliptic orbits have been assigned in the Catalogue to various comets, of which however no 2nd returns have as yet taken place.

Elliptic orbits have been assigned by some computers to certain other comets; of which it must be said that the probability is not sufficiently great to warrant their being included in a list of undoubted elliptic comets.

▲ This summary does not include comets discovered subsequently to Dec. 31, 1888.