The gathering which served to fix the type for all time to come was Edward I.'s so-called Model Parliament of 1295. To this parliament the king summoned severally the two archbishops, all of the bishops, the greater abbots, and the more important earls and barons; while (p. 013) every sheriff was enjoined to see that two knights were chosen from each shire, two citizens from each city, and two burgesses from each borough. Each bishop was authorized, furthermore, to bring with him his prior or the dean of the cathedral chapter, the archdeacons of his diocese, one proctor or agent for his cathedral chapter, and two of his diocesan clergy. In the parliament as actually convened there were 2 archbishops, 18 bishops with their lesser clergy, 66 abbots, 3 heads of religious orders, 9 earls, 41 barons, 63 knights of the shire, and 172 representatives of the cities and boroughs--an aggregate of approximately 400 persons. There were thus present in the assemblage, in person or by deputy, all of the constituent orders of English society, and the irregular device of Simon de Montfort was vested at last with the character of legality. After Edward I. Parliament may be said to have been an established institution of the realm. Its meetings long continued intermittent and infrequent, and its powers from time to time varied enormously, but the place which it filled in the economy of the nation grew ever more important. *13. Establishment of the Bicameral System.*--Like its counterpart in France, the Estates-General, the English Parliament comprised the three great estates or orders--nobility, clergy, and commons--of which, aside from the peasantry, mediaeval society in all western European countries was composed. In the working out of its internal structure, however, two chambers resulted, rather than, as in France, three. Originally the three estates sat separately. Their primary business was the voting of supplies and, the principle being that a tax ought to be conceded by those who would be called upon to pay it, the natural course was for the lords to grant their scutages and aids, the commoners their tenths and fifteenths, and the clergy their subsidies, apart. Indeed there is reason to believe that at times even the knights and the burgesses deliberated separately. Gradually, however, there appeared certain affiliations of interest which operated to modify the original practice. In the first place, the lesser clergy, inconvenienced by attendance and preferring to vote their contributions in the special ecclesiastical assemblages known as the convocations of Canterbury and York, contrived to throw off entirely their obligation of membership. The greater clergy and the greater barons, in the next place, developed sufficiently large interests in common to be amalgamated with ease in one body. Similarly, the lesser barons found their interests essentially identical with those of the country freeholders, represented by the