Correspondence concerned primarily with preparations for expeditions to Spain, North Africa and Sicily to observe the total solar eclipse, 21-22 December 1870. The correspondents include J.C. Adams, J.F.W. Herschel, J.R. Hind, W. Huggins, P.J.C. Janssen, Sir J.N. Lockyer, S. Newcomb, B. Peirce, C. Pritchard, H.E. Roscoe, C.B. Vignoles and J. Winlock. There is a report by J. Carpenter, a paper by Sir J.N. Lockyer bearing a ½d stamp, papers on longitude experiments with telegraphs, and an advertisement for the South London Working Men's College.