On the basis of the above arrangement the Bill of Mr. Gladstone was founded. Absolute local autonomy was conferred on Ireland; the assent of the Irish members to quit the Imperial Parliament was accepted; and the Bill provided that after a certain day the representative Irish peers should cease to sit in the House of Lords, and the Irish members vacate their places in the House of Commons. Provisions were then made for the absorption in the Irish Legislative Body of both the Irish representative peers and Irish members.
The legislative supremacy of the British Parliament was maintained by an express provision excepting from any interference on the part of Irish Legislature all imperial powers, and declaring any enactment void which infringed that provision; further, an enactment was inserted for the purpose of securing to the English Legislature in the last resource the absolute power to make any law for the government of Ireland, and therefore to repeal, or suspend, the Irish Constitution.
Technically these reservations of supremacy to the English Legislature were unnecessary, as it is an axiom of constitutional law that a sovereign Legislature, such as the Queen and two Houses of Parliament in England, cannot bind their successors, and consequently can repeal or alter any law, however fundamental, and annul any restrictions on alteration, however strongly expressed. Practically they were never likely to be called into operation, as it is the custom of Parliament to adhere, under all but the most extraordinary and unforeseen circumstances, to any compact made by Act of Parliament between itself and any subordinate legislative body. The Irish Legislature was subjected to the same controlling power which has for centuries been applied to prevent any excess of jurisdiction in our Colonial Legislatures, by a direction that an appeal as to the constitutionality of any laws which they might pass should lie to the Judicial Committee of the Privy Council. This supremacy of the imperial judicial power over the action of the Colonial Legislatures was a system which the founders of the American Constitution copied in the establishment of their supreme Court, and thereby secured for that legislative system a stability which has defied the assaults of faction and the strain of civil war.