There has been a great deal of valuable work done in the department of Social Philosophy in recent years; and, though much of it has been of a controversial character, it seems possible to indicate some leading conceptions about which there is not now very much difference of opinion, and which may be taken as furnishing a firm basis for future work. Many of the older conceptions—such as the Divine Right of Kings, the Social Contract, and the unqualified emphasis on either Liberty or Equality—have either passed into complete oblivion or are maintained in forms so greatly modified as to be hardly recognizable. Some others are perhaps just on the point of disappearing; but the following conceptions and special problems in which they are involved may be singled out as still retaining a certain degree of vitality.