Ethics or Moral Philosophy investigates the application of the terms good and bad. We constantly use these predicates, and Ethics is an inquiry into our use of them. But this pair of terms is used over a very wide field and no one inquiry could cover it all. A ship or a tea or a house may be called good; and the investigation of such judgments would require a knowledge of ships, teas, or houses. Moral philosophy does not pretend to cover the whole field or to investigate every use of the terms: it is concerned only with the. moral use, or more explicitly with the use of the terms in reference to human conduct. And even this limitation may not be sufficient.