S.-I. AKASOFU, B. FOQLE and B. HAUR~ITZ (Editors): Sydney Chapman, Eighty-from his friends. University of Colorado Press, 1968. xiii + 230. Soft cover $295, hard covers $5.95. PROFFSSORChapman has enjoyed a scientific career of extraordinary distinction and extraordinary length, during which he has acquired a remarkable number of friends and admirers. This book from his friends is a tribute to Professor Chapman on the occasion of his eightieth birthday. It contains a number of reviews of his scientific contributions to The Kinetic Theory of Gases, Meterology, Geomagnetism and The Physics and Chemistry of the Upper Atmosphere, and a collection of Chapman anecdotes from all parts of the world with some of Professor Chapman’s own personal reminiscences. It is a unique document of absorbing interest to those who know him and perhaps also to others, less fortunate, who do not. A. DALGARNO