Originally published in 1952, this book by E. A. Milne examines the life and work of influential astrophysicist Sir James Jeans. The text includes reproductions of correspondence between Jeans and such luminaries as G. H. Hardy and G. E. Hale, and is introduced by a personal memoir by the publisher S. C. Roberts. This book will be of value to anyone with an interest in Jeans' work and the history of astrophysics.