The term "dislocation" is used in several different senses in the literature of mechanics. In the elassic work of VOLTERRA, WEINGARTEN, and SOMIGLIANA, it refers to particular solutions of the equations of linear elasticity, in which a con- tinuous field of strain does not correspond, globally, to a continuous field of dis- placement. The configuration of the body so obtained, even when that body is free of all load, is subject to interior stress...