"Because," she had replied, with her admirable common-sense, "because, if my fears should prove to be unhappily only too well-founded, I shall, at least, have made the discovery before it is too late." And, in spite of all his protests, Peter had to go. Sophia sought to reconcile him to this necessity by pointing out the advantages of travel, the enlarging effect it would have upon his mind, and the opportunities a long sea-voyage afforded for regular and uninterrupted study on the lines she had already mapped out for him; but, despite these consolations, he went away in low spirits. When the moment came for parting, even the strong-minded Sophia was seized with a kind of compunction. "Something tells me, Peter," she said, "that the ordeal will prove too much for you: in spite of your good resolutions, you will sooner or later be drawn into some flirtation which will make you forget me. I know you so well, Peter!" "I wish you could show a little more confidence in me," he had answered, in a wounded tone. "Since I met you, Sophia, I have ceased to be the butterfly I was. But as you seem to doubt me, it may relieve your mind if I promise faithfully that, while I am away from you, I will never, under any inducement, allow myself to overstep the limits of the most ordinary civility towards any woman with whom I may be brought in contact. I swear it, Sophia! Are you satisfied now?" Perhaps he had a secret prevision that a time might come when this oath would prove a salutary restraint upon his straying fancy, and it certainly had an immediate and most reassuring effect upon Sophia. Tourmalin had gone out to Australia, had seen something of the country during his stay in the colony, and was now, as we have seen, on his return; and during the whole time his oath, to his great credit, had been literally and faithfully kept. During the voyage out, he had been too persistently unwell to be inclined to dally with sentiment; but in his subsequent wanderings, he had avoided, or rather escaped, all intercourse with any Colonial ladies who might by any possibility affect his allegiance to Sophia, whose image consequently still held undisputed possession of his heart. In case he should feel himself wavering at any time, he had been careful to provide himself with a talisman in the shape of a photograph, the mere sight of which would be instantly effectual. But somehow, since he had been on board the _Boomerang_, the occasions on which he had been driven to refer to this photograph had been growing more and more frequent; while, at the same time, he had a tormenting consciousness that it took an increasingly longer time to work.