The Constitution Act of 1867 provides that Canada shall have a constitution similar in principle to that of the United Kingdom. A constitution similar in principle to that of the United Kingdom is one founded on a parliamentary democracy. Parliament, as part of that parliamentary democracy, has a number of privileges, rights and powers, as well as procedures and other conventions that
govern their proceedings and manner of acting in different circumstances.
The words "practices of Parliament" were intended to capture not only things that were set out in the rules and procedures of the Legislative Assembly, not only things that were included in the Legislative Assembly and Executive Council Act or conventions of this Legislative Assembly, but also to include all those other privileges of a Parliament in a parliamentary democracy.