Book 4
1297b
It has then been said what is the reason of there being several forms of constitution, and why there are others besides those designated by name （for there is not one single democracy only, and similarly there are more than one of the other forms）, and also what are the differences between them and what is the reason why these differences occur, and in addition to these points, which is the best of the constitutions speaking generally, and of the other constitutions which sort is suited to which sort of people.
1297b
And again, let us speak about the points that come next, both generally and with reference to each constitution separately, taking their appropriate starting-point. All forms of constitution then have three factors in reference to which the good lawgiver has to consider what is expedient for each constitution; and if these factors are well-ordered the constitution must of necessity be well-ordered, and the superiority of one constitution over another necessarily consists in the superiority of each of these factors. Of these three factors one is, what is to be the body that deliberates about the common interests,
1298a
second the one connected with the magistracies, that is, what there are to be and what matters they are to control, and what is to be the method of their election, and a third is, what is to be the judiciary.
1298a
The deliberative factor is sovereign about war and peace and the formation and dissolution of alliances, and about laws, and about sentences of death and exile and confiscation of property, and about the audits of magistrates. And necessarily either all these decisions must be assigned to all the citizens, or all to some of them (for instance to some one magistracy or to several), or different ones to different magistracies, or some of them to all the citizens and some to certain persons.
