British North America Act, 1867, S. 18

18. The Privileges, Immunities, and Powers to be held, enjoyed, and exercised by the Senate and by the House of Commons and by the Members thereof respectively shall be such as are from Time to Time defined by Act of the Parliament of Canada, but so that the same shall never exceed those at the passing of this Act held, enjoyed, and exercised by the Commons House of Parliament of the United Kingdom of Great Britain and Ireland and by the Members thereof.

18. The privileges, immunities, and powers to be held, enjoyed, and exercised by the Senate and by the House of Commons, and by the members thereof respectively, shall be such as are from time to time defined by Act of the Parliament of Canada, but so that any Act of the Parliament of Canada defining such privileges, immunities, and powers shall not confer any privileges, immunities, or powers exceeding those at the passing of such Act held, enjoyed, and exercised by the Commons House of Parliament of the United Kingdom of Great Britain and Ireland, and by the members thereof.

[Note: Section 18 (in italics) was repealed and the new section substituted by the Parliament of Canada Act, 1875 (No. 13 infra).]