  Quine also has things to say on more familiar epistemological themes. In some cases he indicates how they can be integrated into his approach; thus he suggests that we can (albeit unrealistically) schematize the testing of a scientific theory by thinking of ourselves as deriving observation categoricals which can then be directly tested against observation sentences. In other cases he is content to adopt more or less unchanged the account given by earlier authors, as in his list of the virtues of a theory (see 1990a, 20). Our account above has stressed the most novel parts of his epistemology.