ed. (1938), p. 291; Blackham v. Pugh (1) ). Proof of express malice
will therefore defeat privilege (Gatley, 3rd ed. (1938), p. 291; Macin-
tosh v. Dun (2)). The protection afforded to defamatory state-
ments made in self-defence is founded not on the private interest
of the individual but on the convenience and welfare of society
generally (Holmes, Common Law, pp. 138, 139; Gatley, 3rd ed.
(1938), p. 215; Macintosh v. Dun (3)). The right of self-defence
is a right which the law permits to repel a charge or defamatory
accusation operating to the defendant's detriment (Gatley, 3rd ed.
(1938), pp. 290, 291, 297, 299; Brewer v. Chase (4) ). So long as
the defendant might honestly or on reasonable grounds believe that
certain words used by him were true and were necessary for the
vindication of his protection, they will be protected, even if untrue,
if they are used as part of his defence to the accusation (Adam y.
Ward (5) ). For example, (a) words may go beyond what is reason-
ably necessary for self-defence, but they must still be for the purpose
of self-defence ; (b) the words may assert that the plaintiff is known
to be in the habit of making mis-statements (O'Donoghue v. Hussey
(6); Gatley, 3rd ed. (1938), p. 297). The essential ingredient of the
foregoing is that the occasion is used, more widely perhaps than is
necessary, for an answer, denial or explanation of a charge made by
the plaintiff, even though it includes as part thereof an allegation
of the plaintiff's mendacity. That ingredient is lacking if the
occasion (as here) is used for another purpose, such as bringing a
fresh accusation or making a countercharge not connected with the
allegation to be repelled (Gatley, 3rd ed. (1938), p. 299). The plea
of privilege is to the whole of the words complained of. If an exam-
ination of the words shows that any words were published for a
reason other than self-defence, the whole plea fails. The language
used requires a judge to direct that the words most defamatory
of the plaintiff were published not in the exercise of a right of self-
defence, but for the purpose of attacking the plaintiff so as to drive
the plaintiff to proceed by action, so that the defendant could prove
his allegations in a court of law. The article must be construed as
a whole to see what was the purpose of the defendant: to exercise
a right of self-defence or to do something more. When construed,
it shows that the words were not published by way of self-defence
but by way of provocation to a course of action, i.e., litigation.
The heading of the article, " Calwell can sue on this," states the