Streszczenie:
The general characteristic of fundamental statements of neopositivism concerning the problem of the possibility to study reality, beyond the level of physical knowledge, is given in this paper. The postulates of radical empiricism, formulated by M. Schlick and R. Carnap, are here critically appreciated in confrontation with K.R. Popper’s deductionistic conception. The inconsistency of individual postulates of logical positivism as well as the incompatibility with solutions accepted in Contemporary scientific methodology is shown in the analysis of development of the fundamental neopositivistic principles.