can only be deprived by altering the legal character of a past transac- 4 yorparian
tion. Ifa regulation deprives a litigant of such a right it is operative Coan
with regard to past time and to past circumstances and so has an fo, suave
antecedent or retrospective operation. In Phillips v. Eyre (1) Willes Fupnrarioy
J.,in delivering the judgment of the Court, cited a passage from the 4 ymrrrenp
judgment of the Supreme Court of the United States in Calder v. Coan
Bull (2), in which the following sentence occurs: " Hvery law that ae
is. to have an operation before the making thereof, as to commence
at an antecedent time ; or to save time from the Statute of Limitations ;
or to excuse acts which were unlawful, and before committed, and
the like; is retrospective." In Moon v. Durden (3) Platt B. said :
"A statute may have a retrospect to a time antecedent to that of its
commencement. Thus, a statute which compels a covenantor to do
an act, which before the passing of the statute he had covenanted
not to do, or which forbids his doing an act, which he had before the
passing of the statute covenanted to do, repeals the covenant." To
adapt, with respect, the words of Buckley L.J. in West v. Gwynne
(4), if an event has happened before the regulation is passed so that
at the moment when the regulation comes into operation a right of
appeal exists, an investigation whether the transaction is struck at
by the regulation involves an investigation whether the regulation
is retrospective. In order, therefore, to deprive the respondents of
their right of appeal, reg. 16a must operate upon that right from
the date when the right first came into existence and so must take
effect upon that right from 5th December 1941. It follows that the
regulation is expressed to take effect with respect to Mr. Morrison's
order from a date before the date of its notification. Sub-sec. 2, in
my opinion, prevents regulations being passed which have a retro-
spective effect where, as here, the vested right of a person other than
the Commonwealth or an authority of the Commonwealth, existing
at the date of the notification, would be affected in a manner pre-
judicial to that person.