Both science and religion are aspects of human endeavor that do not observe political constraints. It is therefore appropriate that contributions should come from many different countries for a series which attempts to chronicle developments in an interdisciplinary field such as membrane research. This volume is an excellent example of the diversity of thinking, background, and approach needed by the working scientist for his re- search planning. From Canada comes a review by Silverman and Turner of the mech- anisms by means of which the plasma membrane of the renal proximal tubule acts as a...