THE THIRD COMET of 1822.—Neither Gallein his catalogue, nor Karl hi his Repertorium der Cometen Astronomie, refers to any observations of this comet except the imperfect ones made by

Gaturegli at Bologna, and two by Gambart at Marseilles, and the only orbits found in the catalogues are the two calculated by Heiligenstein. The comet was however observed at Rio de Janeiro,

from June 18 to June 24, and Henderson reduced the observations, which were made by Lieut. Robertson, R.N., and calculated an approximate orbit upon them. The coinefc approached near to the

earth, and is of some interest upon that account. Mr. Hind has combined the observations of both hemispheres, and with the following results for the elements of the orbit: Henderson's