Charles' remarks were poignant, but somewhat brief -- he noted how sad he is, and also acknowledged how sad the United Kingdom is as well ... highlighting what a beloved figure his mother was, and how well she served the nation throughout her long and storied reign.

He also touched on the fact that the world has changed a lot since she ascended the throne -- and seemed to allude to criticism about the institution of the monarchy ... but he defended it, saying the traditions and values that it upholds continue to carry weight -- even today.

Finally, he discussed the new line of succession -- pointing out that he's obviously the King, Camilla is Queen Consort, and that Prince William and Kate Middleton are now the Prince and Princess of Wales. In the same breath, he also made sure to include PH and MM.

He didn't assign them any titles -- as they've stepped back from their Royal duties -- but he did extend his love to them ... saying he only hopes for their continued success in America.