Most books on judo seem to fall naturally into one of two categories-elementary works designed for the beginner or casual reader, and those which seek to give a comprehensive treatment of the whole ¿eld. The Mechanics of Judo seeks a different and more limited objective. Its sole aim is to increase the student's effectiveness on the mats, and it is addressed primarily to serious judoka who are engaged in regular practice. With this purpose in mind, it is possible to omit many matters of general interest and to present an exhaustive analytical treatment of a limited number of standing techniques. Emphasis is placed on the precise body movements and the reasons why particular positions and movements are desirable or undesirable. Included with these explanations, a checklist for speci¿c points of a technique is also included as well as the consequences of each variation in style so that the student, as he gains experience, will be able to select wisely those forms or modi¿cations most suitable for his own physique and temperament.