This is an unusual book. The wealth of ideas and the range of documentation it contains would have led other scholars to write a large, heavily footnoted tome. Instead, Ernst Kris and Otto Kurz practiced the utmost economy of means without in the least curbing either the boldness of speculation or the variety of the evidence they wished to present. But then these two authors were at least as unusual as was their joint work. Ernst Kris, born in 1900, was in his early thirties, Otto Kurz, born …