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Games, Gods and Gambling

The Heart of the Earth. By O. M. Phillips. Pp. 236. $4.50. 1968. (Freeman, Cooper.) Geophysics, as a formal subject, still appears only at a late stage in the university curriculum in Britain, by which time some potential geophysioists may have become committed to other branches of physics or geology. Thus there is a place for a book which could stimulate the interest of young students in the numerical problems and fabric of the solid earth. On the whole, this book succeeds in this objective and could well be introduced to students at about A level standard. The individual chapters are logically arranged into gravitation and the figure of the earth, the mass of the earth, earthquakes and seismic waves, volcanoes and temperature, continental drift and internal convection, and the earth's magnetic field. Though simply presented, the basic material is up-to-date and accurate, and could well be referred to by more advanced students from other disciplines for general background in this subject. However, it is at its best in the sections, such as those dealing with gravity and seismic waves, in which it presents simple numerical examples or subjects simple models to quantitative tests. These may indicate to the young physicist a new field for applications and point out to the young geologist a need to quantify hypotheses. The short descriptive section on the earth's magnetic field will perhaps be less convincing to both groups.