Correspondence on comets, including the Comet of 1556; Comet of 1811; Bruhn's Comet, Encke's Comet; Brorsen's Comet (1857); Klinkerfeus's Comet (1857); the fifth and sixth comets of 1857; the eight comets of 1858; and Fayé's Periodical Comet. The correspondents are a mixture of international astronomers and amateurs, forwarding observations and making requests. They include J.R. Hind, T. Chevallier, G.S.G. Santini, J. Challis, R. Grant, Y. Villarceau, J.J. von Littrow, J.F. Encke and W.C. Bond. There are numerous circulars, papers on comets, accounts and observations, ephemerides, telegrams, newspaper articles and sketches and drawings, as well as T. Maclear's Cape of Good Hope observations.