81.—The Mental Treatment Act, 1945, is hereby amended by—

(a) the deletion in section 3 of the definitions of “the appropriate assistance officer”, “authorised medical officer”, “chargeable patient”, “joint authority”, “joint board”, “mental hospital assistance”, “visiting committee of an auxiliary mental hospital”, and “visiting committee of a district mental hospital”,

(b) the insertion in section 3 after the definition of “district mental hospital” of the following—

(c) the substitution of “eligible patient” for “chargeable patient” in each case where that occurs.