Abstract
This paper, an outgrowth of the author's doctoral dissertation,2 pre­ sents a necessary and sufficient condition, of a cohomological nature, for a measure space to be localizable in the sense of Segal. 3 In order to state the main theorem, we must fix some terminology and estab­ lish some notation. 1. Definitions. 4 A measure space (Xt R, m) consists of a set X, a boolean ring R of subsets of Xt and a finite, nonnegative, finitely additive measure m on R subject to the requirement:

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