6. The words "(w)here, on the trial of a person for ..." appear in various sections of the Crimes Act, including ss.23(1), 23A(1) and (5), 40, 129 and 130. The other sections of the Crimes Act which commence with these words are ss. 34, 127, 128, 163, 182, 183, 191, 425 and 427. In ss.23(1), 40, 129 and 130 they introduce provisions specifying, in relation to a particular offence, s. 23-murder; s.40-using poison so as to endanger life; s.129- cattle killing; s.130-cattle stealing, what, in specified circumstances, s.23-if provocation appears; ss.40, 129 and 130-if the jury are not satisfied that the accused is guilty of the offence charged but are satisfied that he is guilty of a specified lesser offence, the jury must s.23(1)-"shall acquit ... of murder an find the accused guilty of manslaughter", or may ss.40, 129 and 130-"may acquit ... of the offence charged and find him guilty of (the specified lesser) offence", do. In s.23A(1) the same words introduce the statutory formulation of the "defence" of diminished responsibility which, like provocation, may be raised only in answer to murder. And, in s.23A(5), they introduce a provision enabling the prosecution, in a case where the defence relies on one or other of diminished responsibility or mental illness, to call evidence tending to show one mental state rather than the other.