Correspondence between Airy and W.H. Christie on a great range of business and scientific matters, including computer's salaries, photographic measurements with micrometers, reduction of the 1874 transit of Venus, star position errors, spectral lines, the Time Ball, the Robert Medal, transit instruments, German longitudes, staff leaves of absence, standards, the tides of Malta, Navy telescopes, tradesmen's bills, a holiday forwarding address, chronograph sheets, distribution lists for publications, chronometer repairs, Navy bills, the state of reports, library books, sidereal standards, eclipse arrangements and a bomb in Greenwich Park. There is also correspondence of Christie with E. Dunkin, 1881-1884, and H.H. Turner, 1884-1890, providing reports on the state of the Observatory during Christie's absence.