Correspondence and papers concerning the British Association for the Advancement of Science. The material includes information on the Association's membership, proceedings and meetings, and financial affairs; passes to events; and short articles for bulletins on subjects such as experiments in balloon ascents. There is also a supplement to 'The Scotsman' and 'The Belfast Newsletter' describing the Association meetings and business; a poster for the Royal Society; material on the possibility of a tidal expedition; and the text of Airy's presidential address and its review in 'The Athenaeum'. The correspondents include J. Babinet, W.R. Birt, A. de Morgan, J.D. Forbes, E. Forbes, J.E. Gray, C. Grey, J.S. Henslow, J.V. Liebig, C. Lyell, R.I. Murchison, G. Peacock, J. Phillips, E. Sabine, A. Sedgwick, W. Whewell, T. Thomson, Lord Rosse, Lord Wrottesley, John Russell, R.A. Stafford, R. Fitzroy and T. Andrews.