V. SOCIAL INSTITUTIONS. (1) _The family_: _A._ Constitution, authority, condition of women and children. _B._ Economic organisation.[191] Family property, succession. (2) _Education and instruction_ (aim, methods, _personnel_). (3) _Social classes_ (principle of division, rules regulating intercourse). VI. PUBLIC INSTITUTIONS (obligatory). (1) _Political institutions_: _A._ Sovereign (_personnel_, procedure). _B._ Administration, services (war, justice, finance, &c.). _C._ Elected authorities, assemblies, electoral bodies (powers, procedure). (2) _Ecclesiastical institutions_ (the same divisions). (3) _International institutions_: _A._ Diplomacy. _B._ War (usages of war and military arts). _C._ Private law and commerce. This grouping of facts according to their nature is combined with the system of grouping by time and place; we thus obtain chronological, geographical, or, national sections in each branch. The history of a species of activity (language, painting, government) subdivides into the history of periods, countries, and nations (history of the ancient Greek language, history of the government of France in the nineteenth century). The same principles aid in determining the order in which the facts are to be arranged. The necessity of presenting facts one after another obliges us to adopt some methodical rule of succession. We may describe successively either all the facts which relate to a given place, or those which relate to a given country, or all the facts of a given species. All historical matter can be distributed in three different kinds of order: _chronological_ order, _geographical_ order, that kind of order which is governed by the nature of actions and is generally called _logical_ order. It is impossible to use any of these orders exclusively: in every chronological exposition there necessarily occur geographical or logical cross-divisions, transitions from one country to another, or from one species of facts to a different species, and conversely. But it is always necessary to decide which shall be the main order into which the others enter as subdivisions. It is a delicate matter to choose between these three orders; our choice will be decided by different reasons according to the subject, and according to the public for whom we are working. That is to say, it will depend on the method of exposition; it would take up too much space to give the theory of it. II. When we come to the selection of historical facts for classification and arrangement, a question is raised which has been disputed with considerable warmth.