Seymour Glagov The last meeting, devoted exclusively to an examination of the atherosclerotic plaque, took place in Chicago 25 years ago under the joint auspices of the Council on Arteriosclerosis of the American Heart Association and the Chicago Heart Association. The proceedings were published subsequently in a volume entitled "Evolution of the Atherosclerotic Plaque," edited by Richard J. Jones (1). Both experimental and human lesions were considered and several provocative new approaches to the disorder were discussed. The electron microscope was being applied systematically to the study...