engineering in nuclear power is briefly discussed in Chapter I. Chapter 2 covers the essentials of the nuclear reactions needed for following subsequent chapters. However, it might be recommended that readers get a little more familiar with the reactor theory in another text on the subject, before getting into Chapter 3, which is a very informative and important chapter in the book. It covers material on the comparison of batch and continuous cycles of fuel irradiation, neutron balance, fuel consumption, and reactivity changes. In Chapters 4 & 5, the chemical properties and the processing of more important reactor materials, i.e., uranium, zirconium, thorium, and beryllium are described in fair detail. The author~ take the trouble to point out sources of information for further details at the end of each description besides that contained in the references. Chapter 6 describes the solvent extraction of metals which is becoming more and more important in recent time, because of its increasingly wider application. Chapters 7 & 8 cover the properties of irradiated fuel and separation or reactor products. The remaining four chapters deal with isotope separations in detail. Theory involved is presented clearly, then authors incorporate it with recent practices of industry. Rather complete table of properties of the Nuclides is included in the Appendix and it is very useful.