In November 1986, I was invited to attend a symposium held in Barcelona on Diseases of the Pericardium. The course was directed by Dr. J. Soler-Soler, director of Cardiology at Hospital General Vall d'Hebron in Barcelona. During my brief but delightful visit to this institution, my appreciation of the depth and breadth of study into pericardial diseases, carried out by Dr. Soler and his group, grew into the conviction that these clinical investigators have accumulated a wealth of information concerning pericardial diseases, and that investigators and clinicians practicing in English speaking countries would greatly profit from ready access to the results of the clinical investiga­ tions into pericardial disease carried out in Barcelona. The proceedings of the Barcelona conference were published in a beauti­ fully executed volume in the Spanish language edited by Dr. Soler and pro­ duced by Ediciones Doyma. Because I believe that this work should be brought to the attention of the English speaking scientific and clinical com­ munities, I encouraged Dr. Soler to have the book translated into English. I knew that this task could be accomplished and that the book would be trans­ lated into good English without change of its content. My confidence was based upon a translation of my own book, The Pericardium, into Spanish undertaken by Dr. Permanyer, who is a contributor and co-editor of the pre­ sent volume.