The general considerations of linguistics which throw light upon the procedure of science are discussed by L. Bloomfield in the fourth number of volume one of the “International Encyclopedia of Unified Science” (Linguistic Aspects of Science. By Leonard Bloomfield. Pp. viii + 60. (Chicago: University of Chicago Prese; London: Cambridge University Press, 1939.) 5s. net.). If language is taken into account, science can be distinguished from other phases of human activity by agreeing that science shall deal only with events that are accessible in their time and place to any and all observers or only with events that are placed in co-ordinates of time and space, or that science shall employ only such initial statements and predictions as lead to definite handling operations or only terms such as are derivable by strict definition from a set of everyday terms concerning physical happenings.