Theories and observation of the Moon, planets and satellites. There is correspondence on lunar theory, including letters from P.A. Hansen on his 'New Inequalities of the Moon'; letters from T. Henderson on errors in the calculations of J.K. Burckhardt for the Moon's diameter; and 'Extracts from Ephemeris of the Moon for the moment of the passage of her Centre, through the Meridian in Altona, calculated upon M. Damoiseau's Tables for every day of the year 1833'. The volume also includes correspondence on planetary theories, including letters from H.C. Schumacher and T.G. Taylor about Mars, and letters from J.F.W. Herschel on two satellites of Saturn.