Neurath's proposal for the form of protocol statements explicates the multiple embedding of a singular sentence as specifying different conditions for the acceptance of such a sentence as a bona fide scientific datum. Before theories are accepted or rejected in the light of such evidence, however, a further condition must be met which Neurath did not formalize. The different conditions are discussed and shown to constitute a naturalistic theory of scientific data and a pragmatic theory of theory acceptance.

The dispute between Schlick and Neurath over het foundations of empirical knowledge illustrates the difficulties m trymg to draw epistemological conclusions from a verificationist theory of meaning. It also shows how assummg the general correctness of science does not automatically avoid, or provide an easy answer to, skepticism. But while neither Schlick nor Neurath arrived at a satisfactory account of empüical knowledge, there are promising hmts of a better theory m their writmgs. Following up these hints, and drawing on further (...) ideas m Hempel, Carnap and particularly Quine, I suggest the direction I think a naturalistic epistemology should take. (shrink)