The defendants then can take no comfort from any context of the agreement of 1889. But that document is avowedly "supplemental" to what it designates "the principal agreement," that of 24th January 1868, and in Article 9 the parties covenanted that, except so far as the principal agreement was modified by that of 1889, the principal agreement, so far as its provisions were then subsisting and capable of taking effect, should remain in full force. They intended, therefore, that the agreement of 1868 should as far as possible be treated as written afresh into the agreement of 1889. Article 6 of the principal agreement gives the company "the exclusive right of submarine telegraphic communication" between Victoria and Tasmania for 20 years from the opening of communication, which was the 1st day of May 1869, subject to determination in the event of an interruption extending beyond twelve months. This is the provision, enlarged as to time by Article 1 of the agreement of 1889, which I have already dealt with in connection with that document. Article 8 gives the Government priority in respect of their messages, and provides also that they shall "be entitled to obtain and have the exclusive use of the said submarine telegraph upon giving reasonable notice to the company ... and upon payment to them of an amount equivalent to the cost of the line and the value of the profits thereof including the Government guarantee" - that is, the subsidy - to be determined by arbitration. It is here made clear that it will be necessary for the Government to pay the cost of the line and the value of the profits before they can obtain a title to its exclusive use. But if the defendants' contention is correct they can, by abolishing the rates between the company and the public, obtain, in effect, the exclusive use of the line without any terms whatever. But that cannot be seriously urged. Thus the wide context of the two agreements taken together gives no help to the defendants' contention as to the meaning of the power to reduce rates; and it derives, as I have endeavoured to show, no support from the narrower context of the agreement of 1889 or that of the Article, taken by itself, of which it is part. I think the plaintiff company are justified in attributing to the two documents the meaning that they were to enjoy up to the 30th of April 1909 the monopoly of the traffic and of the profits thereof; that provision was made that the Government should be enabled to see that these profits did not become inordinate, and to that end should have power to reduce the rates in the interest of the individual citizen: yet that it was never contemplated by the parties that nothing should be received in ease of the guarantee of £5,600, or that it should be brought into the position of a mere arbitrary addition to the subsidy of £4,200 a year. The right of the plaintiffs to make some profit cannot be eliminated from a reasoned construction of the two agreements. To do away with the charges altogether would wrongfully annul that right. It would involve the Government in the absolute addition of a sum of £5,600 a year to the subsidy, and take the first named sum out of the category of a guarantee, in which by their own terms the parties have placed it throughout. For they made it a merely contingent liability, payment of the whole of which could never become necessary. In my opinion the construction contended for, instead of carrying out the intentions of the parties in 1868 and 1889, would enable the defendants to defeat those intentions in very material respects. Complete effect can only be given to the compact of the parties by the continuance to the plaintiff company of the opportunity to make some, and perhaps a substantial, profit from the public traffic along their cables. Using the words of Cockburn C.J. in the case of Stirling v. Maitland[1]: - "I look on the law to be that, if a party enters into an arrangement which can only take effect by the continuance of a certain existing state of circumstances, there is an implied engagement on his part that he shall do nothing of his own motion to put an end to that state of circumstances, under which alone the arrangement can be operative," or, as the present Lord Chief Justice of England has put it, "without the continuance of which effect cannot be given to the arrangement." Lord Alverstone C.J. in Ogdens, Ltd. v. Nelson[2], citing Stirling v. Maitland[3], and Telegraph Despatch and Intelligence Co. v. McLean[4]. I hold, therefore, that the Government of the Commonwealth was not entitled to "reduce to nothing and abolish" these rates, for it had impliedly covenanted to do nothing of its own motion to put an end to them, since full effect could not be given to the agreements without their continuance. The Order in Council could not be effective as a lawful exercise of the power to reduce rates. As, therefore, there has been no valid exercise of the power, the plaintiffs are entitled to a continuance of the rates fixed in 1902 until they are reduced in terms of the agreement.