The present volume covers the three-dimensional aspects of the material contained in the first volume. There is an additional chapter on the special functions that arise in the solution of the problems treated; the basic proper­ ties and representations of these functions are derived in a simple and straight­ forward manner. As in the first volume, the topics in each chapter are motivated by their physical origins and are supplemented by examples, as well as by exercises. A few additional but pertinent references have also been included.