narrow. There may be arbitration for the prevention as well as
for the settlement of industrial disputes, and prevention may be
operative in two ways. 'The effective settlement of each dispute,
as it arises, tends to prevent the recurrence of further disputes in
the same trade. Again, prevention may be accomplished by the
arbitral adjustment of conditions of employment which, if left
unadjusted, would be likely to lead to industrial disputes. The
authority to make a common rule, conferred by the Act, amounts
to no more than authority to make that adjustment. An award
regulating industrial conditions in a trade, and yet not binding
on all persons engaged in it, is likely to produce discontent
amongst persons not bound, and may operate harshly on em-
ployers obliged to fulfil new and onerous obligations, from which
their competitors in the trade, not under the award, are free.
If the Court sees that the conditions thus produced must, sooner
or later, lead to industrial disputes, it is enabled by means of the
provisions under consideration to intervene before any industrial
dispute has developed, inquire into all the circumstances, ascer-
tain how persons, not under the original award, are likely to be
affected by the making of the common rule, and, if it thinks fit,
make an order and declaration bringing industrial conditions
throughout the trade into uniformity." That is, I think, a fair
statement of Mr. Duffy's argument and I am prepared to assent
to much of what he has advanced. The broad interpretation of
the Constitution suggested has a great deal to commend it, and
many good reasons have been urged by him in support of the
view that the sub-section authorizes the use of arbitration for
the purpose of preventing industrial disputes from arising, as
well as for settling those that have arisen. That may all be
granted, yet the applicants' contention must fail when the com-
mon rule provisions are brought to the test of even that inter-
pretation. As this Court has already determined on several
occasions, the sub-section carries on the face of it one hard and
fast limit to the exercise of the authority it confers. The power,
whether it is to settle, or to prevent, industrial disputes, must be
exercised by way of conciliation or arbitration, and can be exer-
cised in no other way. An essential condition of its application
must therefore be the existence of conditions in which arbitration