Court that the appellant's submission on this point should be rejected. It is firmly established by a long line of cases commencing at least TALLERMAN
as early as Goss v. Lord Nugent 1 and ending with cases such as Morris v. Baron &Co. 2 and British &Beningtons Ltd. v. North Western Cachar Tea Co. Ltd. 3-and, indeed, including Goss V. Lord Nugent (1) itself-that the parties to an agreement may vary (VICTORIA)
some of its terms by a subseuqent agreement. They may, of course, rescind the earlier agreement altogether, and this may be done either expressly or by implication, but the determining factor must always be the intention of the parties as disclosed by the later agreement. Variation, of course, may involve partial rescission as is pointed out in Salmond and Williams on Contracts, 2nd ed. (1945), pp. 488, 489, but "Partial rescission
does not completely destroy the con- tractual relation between the parties. It merely modifies that relation by cutting out part of the rights and obligations involved therein, with or without the substitution of new rights and obliga- tions in their place. Partial rescission is not the extinction of the contract but the variation of it." Hence it is said A contract may be varied (1) by way of partial rescission without the substitu- tion of new terms in place of those rescinded, or (2) by way of partial rescission with the substitution of new terms for those rescinded, or (3) by the addition of new terms without any partial rescission at all." These passages, in my view, correctly state the accepted view of the manner in which an agreement by way of variation operates.
In applying the proposition advanced by the appellant in the present case it was contended that the arrangement evidenced by the correspondence referred to was contractual in its nature and that, instead of merely modifying or qualifying the existing con- tractual rights and obligations of the parties, it operated to bring into existence, in the manner indicated, a new contract which redefined their rights. Since the last arrangement is said to have been made in Sydney it is contended that the contract upon which the appellant was entitled to sue was wholly made in New South Wales.
Upon the hearing of the respondent's motion to set aside service of the writ the matter took a curious turn. The contention above- mentioned was advanced by the appellant and, ultimately, that motion was, with the consent of the respondent, dismissed. But it was dismissed only upon an undertaking, given by the appellant that it would, for the purposes of clarification, amend the endorse- ment of the particulars of its claim contained on the writ of summons.
1(1833) 5 B. &Ad. 58 [110 E.R.
2(1918) A.C. 1.
3(1923) A.C. 48.