Mr Speaker, I refer you to page 188 of House of Representatives Practice, which states:

It is not acceptable to raise points of order concerning proceedings earlier in the day or concerning proceedings of a previous day.

This is a ruling that you have enforced previously, Mr Speaker. Can I ask: when is it acceptable for a member to raise a point of order regarding something which has happened earlier in the day, as the Leader of the House just did, and when is it not?