Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: among such states. Those of the logician centre upon the rational correlations of intellectual acts, and result in the formulation of a code of normal laws—a body of precepts —which can be disobeyed but under the penalty of error. In addition to these points of similarity and contrast, the two sciences are related by a certain mutual interdependence. Psychology, like every other science, must conform to the rules of right reasoning; it must observe the canons of inductive and deductive inference, and it must carry out the general precepts of Logical Method. On the other 'hand, the validity of thought may be seriously affected by its genesis. The materials with which the logician works are products which have been analyzed by the psychologist, and, consequently, although Logic is not properly based on Psychology, a false theory of the nature of our cognitive faculties may sap the very foundations of knowledge, and lead to a disbelief in the existence of all real truth. Logic may therefore at times have to appeal to a sound system of Psychology in justification of its fundamental assumptions. Psychology and Ethics.—Ethics as the science of morality is easily distinguished from Psychology. It investigates the right end of human action, the nature and foundations of moral distinctions, the grounds of moral obligation, and the sanctions of morality. It classifies virtues, vices, and duties, and promulgates the rules of right conduct. Whereas Psychology considers our mental activities in their causes. Ethics studies them in their results: and while Logic seeks to harmonize cognition with the order of the physical world—the Real; Ethics would conform volition to the order of the moral world—the Ideal.6 In establishing, however, the existence of moral intuitions, and in exhibiting thei...