This volume contains the edited transcript of the Second Topical Colloquium based on leads developed at the original conference on the artery and the process of arteriosclerosis (the Lindau Conference of 1970). The first follow-up colloquium on "The Smooth Muscle of the Artery" was held in Heidelberg in 1973. Planning for the present one was undertaken by the editors with Dr. C. Forbes Dewey, Department of Mechanical Engineering, Massachusetts Institute...