This volume contains a portion of the presentations given at the session on High Energy Physics and Astro- physics of Orbis Scientiae II, held at the Center for Theoretical Studies, University of Miami, from January 20 through January 24, 1975. This, second in the new series of meetings held at the CTS, strove to implement the goals professed in the organization of Orbis Scientiae in 1974, namely to encourage scientists in several disciplines to exchange views, not only with colleagues who share similar research interests, but also to acquaint scientists in other fields with the leading ideas...