lated in conscious analysis, is ultimate fact against which there is no appeal. Such isolation, or at least some approach to it, is fairly easy in the case of presentational immediacy, but is very difficult in the case of causal efficacy. Complete ideal purity of perceptive experience, devoid of any symbolic reference, is in practice unobtainable for either perceptive mode.
Our judgments on causal efficacy are almost inextricably warped by the acceptance of the symbolic reference between the two modes as the completion of our direct knowledge. This acceptance is not merely in thought, but also in action, emotion, and purpose, all precedent to thought. This symbolic reference is a datum for thought in its analysis of experience. By trusting this datum, our conceptual scheme of the universe is in general logically coherent with itself, and is correspondent to the ultimate facts of the pure perceptive modes. But occasionally, either the coherence or the verification fails. We then revise our conceptual scheme so as to preserve the general trust in the symbolic reference, while relegating definite details of that reference to the category of errors. Such errors are termed ‘delusive
