I n the preface this book is characterized RS a textbook for advanced students, and in fact one feels that it is the result of a successful teaching practice. The logical structure, many clear, verbal explanations of physical facts and mathematical derivations, interspersed conclusions and analogies as well as references to their biological significance make this book suitable for self-instruction. Also the reader, not very familiar with biological transport, will be sasily enabled to intrude into the matter. The mathematical apparatus avoids all unnecessary details and special cases. The arrangement of chapters begins with physicul-chemical fundamentals (chemical, electrochemical potential, equilibria across membranes, free and electrodiffusion). The following paragraphs treat with facilitated diffusion and active transport, essentially in the usual manner. The references to biological structures and the avoidance of pure, abstract model conceptions must be emphasized. One third of the book is devoted to transport phenomena in characteristic biological membrane systems (e. g. ion-and monosochharide transport across red cell membrane, excitation and propsgation of actions potentials in nerves, synaptic transmission, coupled transcellular transports in small intestine and kidney, oxygen diffusion in capillaries and tissue). The index of recommended literatur is restricted to fundamental papers and reviews. The book can be recommend without any limitation as introductionary literature for students of biology and related disciplines (medicine, biophysics, biochemistry) and for all scientists whose research topics touch transport phenomena.