-say he " may" grant it. If it did, the principle of Julius v. Bishop
_ of Oxford (1) would in the circumstances apply, and give such a
; provision compulsory force. The affirmative duty is found, we
think, in other considerations. Magna Charta (9 Hen. III.), c. 30,
relating to foreign merchants said: " All merchants unless they were
openly prohibited before, shall have safe and sure conduct to depart
out of England, and to come into England, and to tarry in and go
through England, as well by land as by water to buy or sell
_ except in time of war." This provision, as is observed in Chitty
on the Prerogative (p. 163), " strongly proves that the English had
this liberty before." International commercial intercourse by sea
(subject to any specially indicated municipal requirement) is always
understood to imply a right to depart with the vessel. Foreign
commerce and intercourse would otherwise be impossible, and one
main object of the Customs Acts, including Tariff Acts, would be
frustrated. The Customs Act must be read with reference to mari-
time practice, applicable to all oversea commerce, inwards and
outwards. It is trite law that Statutes should be construed, so far
as their language permits, so as not to clash with international
comity (Hx parte Blain; In re Sawers (2); Winans v. Attorney-
freneral (3) ; Colquhoun v. Brooks (4); Macleod v. Attorney-General
for New South Wales (5)). So reading it, there is a duty on the Com-
monwealth (by the hand of the Collector) to grant the clearance if
satisfied that the law has been complied with. An arbitrary refusal
or one based on unjustifiable grounds is the denial of a right implicitly
recognized, incorporated into and limited by the Act. By unjustifi-
able grounds, we must not be understood as excluding in all cases
an honest and not unreasonable belief on the part of the Collector
acting for the Commonwealth, that the law has not been complied
with. In times of peace, the refusal alleged in this case, if its
possibility then be assumed, would be a clear primd facie breach
of the Statutes.
'The justification of the Commonwealth, if any, must rest on par.
Sand par. 12 of the defence. Par. 8 raises considerations applicable