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33 Brit. Y.B. Int'l L. 203 (1957)
The Law and Procedure of the International Court of Justice 1951-4: Treaty Interpretation and Other Treaty Points

handle is hein.journals/byrint33 and id is 209 raw text is: THE LAW AND PROCEDURE OF THE
INTERNATIONAL COURT OF JUSTICE 1951-4:
TREATY INTERPRETATION AND
OTHER TREATY POINTS
By SIR GERALD FITZMAURICE, K.C.M.G., Q.C.
Legal Adviser to the Foreign Office
IN the article corresponding to the present one,, that appeared in volume
28 of this Year Book (hereinafter called the 1951 article), dealing with the
findings and pronouncements on treaty law of the International Court of
Justice, and of individual judges, in the decisions and opinions given during
the period up to March 31st, 195 1, the arrangement adopted was to treat the
subject in two main divisions: A, dealing with treaty interpretation; and
B, dealing with substantive points of treaty law. Division A (interpretation)
was itself subdivided into (A) major principles of interpretation; and (B)
subsidiary interpretative findings. It is proposed to follow the same system
for the 1951-4 period now under discussion.
DIVISION A: TREATY INTERPRETATION
On the subject of interpretation, the major principles that seemed to
underlie the work of the Court in the period up to 1951, as these were
described in the 1951 article, were those of I, Actuality (or textual inter-
pretation); II, the principle of the Natural or Ordinary Meaning; and,
subject to thcse two, the principles of III, Integration (or interpretation
of the treaty as a whole); and IV, Effectiveness (ut res magis valeat quam
pereat). To these were added V, the principle of Subsequent Practice,
according to which the effect actually given to a treaty by the parties, and
their conduct in relation to it, is valid evidence as to its true meaning. In
the period 195 1-4, all these principles are reaffirmed or acted upon by the
Court, or by individual judges, in such a way as to confirm their status as
major principles of interpretation. In the light of certain other pronounce-
ments, however, it is proposed to add to the five principles above mentioned
a further one, namely VI, the principle of Contemporaneity, or the inter-
pretation of texts and terms in the light of the meaning they possessed, or
The present article is the fourth in the series comprising the second cycle (March 3 1st, 1951 -
March 3 1st, 1954) of studies on the work of the International Court of Justice, considered from
the standpoint of its interest for, and influence on, general legal theory and principle. The first
three articles in this cycle on 'General Principles and Sources of Law'; 'Points of Substantive
Law, Part I'; and 'Points of Substantive Law, Part II'; appeared in this Year Book, 30-3z
(953-1955/6). A fifth article, completingthe period March 31st, 195 i-March 31st, 1954, is planned
for 1958, after which the author hopes to publish both cycles in book form.

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