Failure of interpolation for quantifiers of monadic type -- Approximation to truth and theory of errors -- Partition relations in arithmetic -- On the axiomatizability of sets in a class theory -- Applications of model theory to real algebraic geometry -- On the space (?)? -- The model extension theorems for ?3-theories -- Completeness theorems for the general theory of stochastic processes -- A barren extension -- Proof functional connectives -- Ultraproducts and categorical logic -- Problems in taxonomy, a floating log -- Counting problems in bounded arithmetic -- Definable ultrafilters and elementary end extensions -- On the axiomatization of PRC-fields -- Formalizations of certain intermediate logics Part I -- Types in class set theories -- Generic extensions which do not ADD random reals.