And an interesting nit it is, Mathias - to which I'll pick one of my own:

The Constitution Act, 1867, of course, was called The British North America Act, 1867, when the provinces of Alberta and Saskatchewan were formed.  Separate school education was and is dealt with in Section 93.

The Alberta Act and Saskatchewan Act (both from 1905) are part of the Constitution of Canada. Section 17 of the original Alberta Act, 1905, for instance, incorporates and alters section 93 for that province, beginning in this fashion:

17. (1) Section 93 of The British North America Act, 1867, shall apply to the said province, with the substitution for paragraph (1) of the said section 93, of the following paragraph:--
    "Nothing in any such law shall prejudicially affect any right or privilege with respect to separate schools which any class of persons have at the date of the passing of this Act..."

It reads the same now, with the reference to BNA Act replaced by Constitution Act, 1867.