Letters to Thomas Maclear on a variety of subjects, including requests for chronometers; requests for sets of observations and publications; instructions for work to be carried out; observations made at Williamstown, Victoria, 16 November 1859; work on the weights and measures bill; and accounting matters. There are also letters from the Admiralty referring to the renewal of the transit clock, 9 April 1857, and a printed notice on the 'Revolving Light on the Cape of Good Hope', 2 April 1860.