Temperature Plasmas", an article which dispenses with details of derivations and concentrates on interpretation and understanding. It is written in a genial leisureliness so that a reader can get through it unimpaired by the aridity inherent in the telegraphic style of writing imposed by most journals. This would form a good basis for a graduate seminar and the bibliography is extensive. Griggs and Baker discuss the problem of earthquakes of deep origin. The description is of the continuum in terms of the known mechanical properties of materials under static loads. A concomitant article follows by Guy Higgens on the response of rocks to stress. He notes among other things that the pressurevolume relations for a material are similar under both static and dynamic loading: a not-too-obvious statement. Russel E. Duff concludes this section with a thorough microscopic discussion of equations of state at high pressures. It is through the knowledge contained in this chapter that the phenomena of the previous two can hopefully be deciphered. The review is concise, critical, and stresses the stop-gaps, both theoretical and experimental. Here one will find a discussion of Thomas-Fermi models, Hartree-Fock methods, band structure, physical, magnetic and electrical properties, all reviewed in brief leaving details to a bibliography. Herman F. Mark works in the difficult field of condensed polymers. The most dramatic changes in materials occur to t,hose which contain atoms and molecules with many unoccupied inner shells that will allow compression into condensed forms. This field should some day contribute a volume of knowledge comparable to that of the field of plastics, beginning with results of 20 years ago. A very imaginat,ive and refreshing article is one by H. P. Diirr on approximate symmetries in atomic physics and elementary particles. The article is lucid, well written and an example of how group theoretical thinking can yield understanding without t,edious classical analysis. Kenneth M. Watson addresses himself to the problem of atomic reactions in the pre-Born approximation (low energy). In particular, he reformulates the method of crossing