 It should be noted that this passage is quoted from Feigl’s reply to criticisms brought forward by his logical empiricist colleagues Philipp Frank, Carl Gustav Hempel, and Ernest Nagel (the context being a symposium on Feigl’s “Existential Hypotheses”). Hempel, for instance, had argued that the notion of the reference of theoretical terms is “unnecessary” because it “can be eliminated, by means of Feigl’s own criterion of factual reference” (Hempel 1950b, p. 173), namely the systematic interconnections between theoretical statements on the one hand and observations sentences on the other. In a similar vein, Frank had objected that “after the introduction of the truth conditions a statement in the language of ‘semantical realism’ can no longer be distinguished from a statement in the language of ‘syntactical positivism’” (Frank 1950, p. 167). Quite the same was brought forward by Nagel who argued that by heavily relying on confirmability Feigl completely remains within the ‘received’ logical positivist agenda, so that his talk of ‘realism’ should be regarded as devoid of any distinctive character. According to Nagel, “Feigl is pressing for a distinction without a difference” (Nagel 1950, p. 179).