We are proud to present Volume 3 of Biological Magnetic Resonance, a series that has met with praise from the scientific community. This volume covers the new applications of various multiple irradia tion techniques to the NMR of biomolecules; the chapter of Keller and Wuthrich describes much of the technique and its applications to hemo proteins. The ESR of some hemoproteins in the single crystal is described by Chien and Dickinson, who also include discussions of techniques and methods for single-crystal ESR of paramagnetically intrinsic and spin labeled protein crystals. Mims and Peisach...

We take great pleasure in presenting Vol. IV of Biological Magnetic Resonance, a series that continues to give us pride. In this volume, we are pleased to have our first chapter on the applications of ESR to problems in medicine, written by Butterfield. Armitage and Otvos describe their extensive Cd-l13 NMR study in a chapter that should delight the spectroscopists as well as the biochemists, since the systems investigated have not yet been modeled. Kaptein presents an eloquent exposition of the principles and applications to biological systems of the photo-CIDNP technique, to which he has...