This book provides the reader with a major selection of papers presented at the XIth International Conference on Calcium Regulating Hormones, held in Florence, Italy, April 24-29, 1992. The quality of the scientific program was excellent, and approximately 1200 delegates attended. The papers published in this volume were selected by the Conference's Program Committee for scientific content and currentness, and as such provide an invaluable reflection of much of the current thinking in the field of calcium and bone research. A summarized version of the contents is provided hereunder.