S. 16 rep. in pt. by 1968 c. 21 (NI), residue spent
S. 17(1) adds s. 19A to 1950 c. 3 (NI); subs. (2) spent
S. 18 rep. by 1964 c. 13 (NI)
S. 19 rep. by 1992 NI 3
