The Xlth European Symposium on Calcified Tissues was held at Hotel Marienlyst, Elsinore, Denmark, May 25-29,1975. The main topics were: 1. cellular calcium transport, 2. vitamin D, and 3. osteoporosis. Seventy six of the submitted papers were selected for verbal presentation, and these papers are the basis of the articles found in this book. We hope that the book, which also appears as a supplement to CALCIFIED TISSUE RESEARCH has a form which will be adopted by organizers of future symposia of this series. The Organizing Committee wishes to express its gratitude to the Danish Medical...