Correspondence on comets observed between 1832 and 1847, including Halley's Comet (1835); Encke's Comet (1832, 1835, 1838, 1842); Galle's three comets (1839-1840); Brenniker's Comet (1840); Laugier's Comet (1842); the Great Comet of 1843; Mauvais' three comets (1843, 1845, 1847); Fayé's Comet (1843-44); De Vico's six comets (1844-1846); D'Arrest's Comet (1844); Wilmot's Comet (1844); Colla's Comet (1845 and 1847); Biela's Comet (1845); Brorsen's three comets (1846-1847); and Hind's 1846 comet. The book is comprised largely of correspondence between astronomers, including E.J. Cooper, T. Henderson, J.F. Encke, F. Baily, T. Chevallier, J.F.W. Herschel, H. Goldschmidt, J. Challis, E. Plantamour, G.S.G. Santini, W.C. Bond, B. Pierce, C.H.F. Peters, J.R. Hind and G.B. Airy on subjects such as the comets' ephemerides, elements, position, description and observations. There are a large number of circulars from H.C. Schumacher and ephemerides by J.R. Hind. There are also printed papers; newspaper articles; watercolours; T. Maclear's Cape of Good Hope observations; observations of New Zealand; and the awards of, and procedure for, the King of Denmark's cometary medal.