Letter: The day Charles Darwin came face to face with a Neanderthal / Alex Menez. Letter: Charles Darwin - Palaeomycologist? / Hugh L. Pearson. Darwin's Cambridge summer / Peter J. James. The causes and functions of spirals, helices and vortices in nature / J.L. Cloudsley-Thompson. The 'long-winged Troides": discovery of the largest butterfly in the world, in Papua New Guinea, by Albert Stewart Meek (1871-1943) / W. John Tennent.