D avid Tilman describes himself as both a theoretical and an experimental ecologist. Currently the McKnight Presidential Chair in Ecology and Regents Professor at the University of Minnesota (St. Paul), Tilman has spent his career developing theories of biodiversity and species composition that he has tested in carefully designed and controlled experiments. His work on resource competition in b...

axiomatics. A main feature of Hilbert’s axiomatization of geometry is that the axiomatic method is presented and practiced in the spirit of the abstract conception of axiomatics that arose at the end of the nineteenth century and which has been generally adopted in modern mathematics. It consists in abstracting from the intuitive meaning of the terms for the kinds of primitive objects (individu...

My talk will focus on the brain mechanisms of addiction with a particular emphasis on the use of brain imaging [both PET and MRI]. I will discuss the latest research in relation to the neurotransmitter mechanisms of addiction and show how we can develop imaging techniques to explore the modes of actions of existing and novel treatments for addiction

An anatomical exposition of the structure of the human body, trans. Lords of the Admiralty for the effectual cure of such seamen belonging to the Navy as may have ruptures, London, 1734. The paper, read on the occasion of the centenary of David Livingstone's death in what is now the independent African country of Zambia, was divided into three sections. The first part was devoted to Livingstone...