Nearly thirty years ago, in 1974, the volume on Angiotensin edited by Irvine H.Page and F. Merlin Bumpus expanded the Handbook of Experimental Pharmacology. Even after two decades the multiplicity of its actions appears not to have been fully discovered. To call attention to its many functions is one of the purposes of this book. This new edition of the volume on Angiotensin attempts to provide an updated account of the knowledge and findings accumulated since the complexity of angiotensin was so accurately recognized.