His mind had been going leisurely over his affairs in general, as he went down to his office; for naturally, now that he was so rich, he had many affairs of his own beside that placid attention to other people’s affairs which was his actual trade; and it had occurred to him that at one point there was a weakness in his armor. One of his investments had not been so skillful or so prudent as the rest, and it looked as if it might call for farther and farther outlay before it could be made profitable, if indeed it were ever made profitable. When he got to the office, Mr. Brownlow, like a prudent man, looked into the papers connected with this affair, and took pains to understand exactly how he stood, and what farther claims might be made upon him. And while he was doing this, certain questions of date arose which set clearly before him, what he had for the moment forgotten, that the time of his responsibility to Phœbe Thomson was nearly over, and that in a year no claim could be made against him for Mrs. Thomson’s fifty thousand pounds. The mere realization of this fact gave him a certain thrill of uncertainty and agitation. He had not troubled himself about it for years, and during that time he had felt perfectly safe and comfortable in his possessions; but to look upon it in actual black and white, and to see how near he was to complete freedom, gave him a sudden sense of his present risk, such as he had never felt before. To repay the fifty thousand pounds would have been no such difficult matter, for Mrs. Thomson’s money had been lucky money, and had, as we have said, doubled and trebled itself; but there was interest for five-and-twenty years to be reckoned; and there was no telling what other claims the heir, if an heir should turn up, might bring against the old woman’s executor. Mr. Brownlow felt for one sharp moment as if Sara’s splendor and her happiness was at the power of some unknown vagabond who might make a sudden claim any moment when he was unprepared upon the inheritance which for all these years had appeared to him as his own. It was a sort of danger which could not be guarded against, but rather, indeed, ought to be invited; though it would be hard--no doubt it would be hard, after all this interval--to give up the fortune which he had accepted with reluctance, and which had cost him, as he felt, a hundred times more trouble than it had ever given him pleasure. Now that he had begun to get a little good out of it, to think of some stealthy vagrant coming in and calling suddenly for his rights, and laying claim perhaps to all the increase which Mr. Brownlow’s careful management had made of the original, was an irritating idea. He tried to put it away, and perhaps he might have been successful in banishing it from his mind but for another circumstance that fixed it there, and gave, as it seemed, consistency and force to the thought.