I must begin this paper by disclaiming any intention of entering into the detail of parliamentary procedure, a matter with which I am not qualified to deal. It has, however, occurred to me that certain changes in the administration of law, changes which begin early in the reign of Henry III, have some relevance to the origin of parliamentary jurisdiction. These changes arise from a new and more severe attitude on the part of the Crown towards franchise, and make necessary important modifications in the exchequer's methods of dealing with it. In time, I think, the many disputes between the Crown and the magnates about privilege, debt, and so forth, gave rise to a volume of petitions and subsequent trials which called for some tribunal in the nature of parliament, and these trials found a nucleus about the exchequer and the council. That is my thesis, and it is with these legal changes and their reaction upon the constitution that I propose to deal. The greater part of this paper is, therefore, concerned with the period before direct parliamentary record, and, indeed, before there is any true court of parliament. It goes very little beyond matters of law, and, if I am forced here and there to refer to the structure and procedure of parliament in later days, I do so very much subject to correction. Even for the early period with which I am concerned, I cannot attempt to assess the importance of that part of parliament which came from the commune consilium of the realm.