1. C. H. Cannon, Department of Botany, Duke University, Durham, NC 27708, USA, and Institute of Biodiversity and Environmental Conservation, University of Malaysia, Sarawak, Malaysia. D. R. Peart, Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA. M. Leighton, Department of Anthropology, Harvard University, Cambridge, MA 02138, USA.