OF AUSTRALIA, applies Elliot v. North Eastern Railway Co. (1); and London H. C. OF and North Western Railway Co. v. Evans (2).
Now was or was not the act of re-letting the land, and thereby authorizing Malone to enter and take possession and exercise all the rights attached by the Statute to an annual lease, an act in derogation of the previous grant to O'Keefe
According to the principle laid down by Bowen L.J. in The Moorcock (3) it was, because an exclusive right of possession connotes that the grantor will not attempt to interfere with it. Lord Justice Bowen's observations were adopted and applied against the Crown by Farwell L.J. in City of Dublin Steam Packet Co. v. The King (4).
Every exclusive licence or right imports a negative, and the person who confers it impliedly enters into a negative under- taking to do nothing to contravene it. For instance, Giffard L.J. said in Catt v. Tourle (5) a grant of an exclusive right like that of supplying a particular public-house with ale contained in a covenant is equivalent to a negative covenant, and enforceable as such. In Heap v. Hartley (6) Fry L.J. said of an exclusive licence to use a patent but in terms which have general appli- cation, "the true nature of an exclusive licence is this. It is a leave to do a thing, and a contract not to give leave to anybody else to do the same thing."
Metropolitan Electric Supply Co. Ltd. v. Ginder (7) was a case where the defendant agreed to take the whole of the electric energy required for his premises from the company. Buckley J., after quoting an important judgment of Lord Selborne, said (8): "He agrees to take the whole from A., which necessarily implies that he will not take from B. As a matter of construction therefore, not by express words but by necessary implication, I think there is here an agreement not to take from others."
And Lord Blackburn in Doherty v. Allman (9), says :-"I think myself the true construction of saying I will maintain a storehouse involves the negative-I will not pull it down." And
(I) 10 H.L.C., 333, at p. 357.
(6) 42 Ch. D., 461, at p. 470. (2) (1893) ] Ch., 16, at p. 27.
(7) (1901) 2 Ch., 799. (3) 14 P.D., 64, at p. 68.
(8) (1901) 2 Ch., 799, at p. 806. (4) 24 T.L.P., 798, at 801.
(9) 3 App. Cas., 709, at p. 731. (5) L.R. 4 Ch., 654, at p. 661.