In the result, so far, the existence of the agreement of 9th September, even assuming it cast no legal obligation on the appellant to rescind it, at least affords no ground for depriving the appellant of the legal right to refuse to proceed with it. It elected to adhere to the contract, to receive the price and to hand over the hall for the evening, and to allow the hall to be used for the purpose of the pieces advertised being performed, rather than return or forego the proportionate part of the hire-money. In so acting it "permitted" the actual infringement on that night and, not having excused itself under the terms of the sub-section, is liable as an infringer. The opposite view would deprive the sub-section of any real effectiveness, because in many cases the only legal remedy would lie against a strolling player whose responsibility would be merely nominal or a company that McCardie J. in the case cited calls "a migratory thing"[19]. The result on this lower basis is perhaps more strikingly shown, though in no way different in principle, if applied to some other classes of acts. Suppose, with a similar power of ending a contract, a proprietor finds or has reason to believe that the hirer is intending to use the premises as a brothel, or for any other criminal purpose; and with this knowledge or belief elects to retain the contract and deliberately hands over to the hirer the premises for the evening and receives the rent: does he or does he not "permit" his premises to be used for the nefarious purposes? In my opinion he does "permit" his premises to be so used; he is really particeps criminis. But he is neither more guilty nor more innocent than the present appellant, applying merely the test of power to terminate the contract. The matter stands, however, still higher. Cowan v. Milbourn[20] shows that as soon as the party to a contract has reason to believe his property is intended to be used for an illegal purpose, he is not merely "entitled" but is "called on and bound by the law, to refuse his sanction to this use of his rooms" (per Kelly C.B., concurred in by Martin B.). On principle that must be so. What Sir John Salmond, in his posthumous work on Contracts (at p. 160), terms "the external condition of continued legality" works a determination of the bargain, a dissolution of the vinculum juris, as soon as the necessary facts appear, which constitute illegality. Intention of the parties as to this is immaterial; no personal intention can create a binding obligation to perform an agreement which either is in its inception or becomes during its existence an agreement to do what the law forbids. In my opinion, therefore, the appellant had no legal right to hand over the hall for the purpose of performing (inter alia) the song; because to perform it in the circumstances was a breach of positive law. The permission actually given on 22nd October was without any lawful obligation to support it.