ARTICLE XXII.
 The present Convention shall continue in force indefinitely but either of the
-Contracting Parties may, on or before 30th June in any calendar year not
-earlier than the year 1954, give to the other Contracting Party, through diplo-
matic channels, written notice of termination, provided that such notice of
termination may be given in any year before 1954 if there should be any
important change in the laws of the other Contracting Party affecting the
 application of Article XVI. In such event, the present Convention shall cease
 to be effective-
 (a) In the United Kingdom:
 as respects income tax, for any year of assessment beginning on or after
 6th April in the calendar year next following that in which the notice
 is given;
 as respects surtax, for any year of assessment beginning on or after
 6th April in the calendar year in which the notice is given; and as
 respects profits tax, in respect of the following profits:-
 (i) protfis arising in any chargeable accounting period beginning on
 or after 1st April in the calendar year next following that in which
 the notice is given;
 (ii) profits attributable to so much of any chargeable accounting period
 falling partly before and partly after that date as falls after that
 date;
 (iii) profits not so arising or attributable by reference to which income
 tax is chargeable for any year of assessment beginning on or after
 6th April in the next following calendar year;
 (b) In Norway:
 for the taxable years beginning on or after 1st January in the calendar
 year next following that in which the notice is given.

 In witness whereof the undersigned, being duly authorised by their respective
 Governments, have signed the present Convention and have affixed thereto their
 -seals.

 Done at London, in duplicate, in the English and Norwegian languages, both
 texts being equally authoritative, on the 2nd day of May, 1951.

 (L.S.) HERBERT MORRISON.


P. PREBENSEN.


(L.S.)