In his recently published book, The Nature of Physical Reality (5), Professor Margenau develops a conception of physical reality, which, on the one hand, is a repudiation of radical empiricism (5: 28) and which, on the other hand, is a denial of realism (5: 47). Margenau believes that he has accomplished his task by means of “constructs” which, in “a large area of discourse,” are “wholly synonymous” with concepts and which, nevertheless, when verified, are “the external objects” (5: 70–71; 296).