of the vendor in the said business and in the assets thereof (including the benefit of the said lease and the option of purchase therein contained)."
By notice dated 15th January 1952 the respondent purported to exercise the option. Such notice, after referring to the lease in detail and naming the parties and premises leased, informed the lessor that the interest of the brother in the option to purchase had been sold and transferred to the respondent and that he was by such notice exercising the option. The notice was dated and signed by the respondent.
The lease having expired on 29th February 1952 the appellant contended that the option had not been validly exercised, whereupon the respondent issued a writ claiming, inter alia, a declaration that the option had been duly exercised by the notice dated 15th January 1952 and an order that the appellant specifically perform the contract formed by the exercise of the option.
The action was heard before Virtue J. who found for the respond- ent, made the declaration asked for and ordered that such contract be specifically performed.
From this decision the appellant appealed to the High Court. J. P. Durack Q.C. (with him B. G. Marshall), for the appellant. T. S. Louch Q.C. (with him O. J. Negus Q.C. and T. A. S. Davy), for the respondent.
Cur. adv. vult. The following written judgments were delivered :-
DIXON C.J. This is an appeal from a judgment of Virtue J. decreeing that a contract formed by the exercise of an option be specifically performed. The option is contained in an unregistered lease in which the plaintiff respondent and his brother are lessees and the defendant appellant is the lessor. The subject of the lease and the option is a station called Lochada " at Perenjori in the Bowgada District of Western Australia, an area of about 302,987 acres held by the defendant under three pastoral leases.
The defendant appellant relies upon two grounds for her con- tention that she is not bound to sell and transfer the property as a result of the purported exercise by the plaintiff respondent of the option. The first is that the option is subject to the due observance of the covenants of the lease and that this condition precedent to its exercise was not satisfied because the plaintiff's brother trans- ferred his interest as co-tenant to the plaintiff, a thing which, according to the defendant's contention, was a breach of covenant. The second ground is that the purported exercise of the option was