18.—Section 72 of the Principal Act is hereby amended in the following respects and shall be construed and have effect accordingly, that is to say:—
(a) by the insertion in sub-section (1) before the words “may (any other Act to the contrary notwithstanding)” of the words “may be then brought back to the reformatory school or”;
(b) by the deletion in sub-section (1) of the word “sixteen” and the substitution of the word “seventeen” in lieu of the word so deleted, and
(c) by the insertion in sub-section (2) before the words “may (any other Act to the contrary notwithstanding)” of the words “may be brought back to the school or”.