And that was all that could be got out of Miss Whiffin. Binns' opinion, that the number of letters given to Arthur had been four, was in a degree borne out: for that was just the number they had been able to trace as having been written to him. Three of them were notes from people in London, making appointments for Arthur to call on them the next day; the fourth (the one spoken of by Binns as having arrived just before Arthur himself) was known to be from Mr. Galloway, that gentleman having despatched it by the day-mail from Helstonleigh. What could have taken Arthur out again? That was the point to be, if possible, solved. Unless it could be, neither the police nor anybody else had the smallest clue as to the quarter their inquiries should be directed to. Had he quitted London again (which seemed highly improbable), then the railway stations must be visited for news of him: had he but strolled out for a walk, it must be the streets. One of the three notes mentioned came from a firm of proctors in Parliament Street. It contained these words from the senior partner, who was an old friend of Mr. Galloway's:--"If it were convenient for you to call on me the evening of your arrival in town, I should be glad, as I wish to see you myself, and I am leaving home the following morning for a week. I shall remain at the office until nine at night, on the chance that you may come." That Arthur, on reading the note, might have hastened to make a call in Parliament Street, was more than probable.--He knew London fairly well, having been up on two previous occasions for Mr. Galloway.--But Arthur never made his appearance there. Though of course that did not prove that he did not set out with the intention of going. Another feasible conjecture, started by Roland Yorke, was, that he might have forgotten some trifling article or other amidst his previous purchases, and gone out again to get it. Allowing that one or other of these suppositions was correct, it did not explain the mystery of his subsequent disappearance. What became of him? If, according to this theory, he walked, or ran, up Norfolk Street to the Strand, and turned to the right or the left, or bore on across the road in pursuance of his purposed way, wherever that might be, how far did he go on that day? Where had his steps halted? at what point had he turned aside? How, and where, and in what manner had he disappeared? It was in truth a strange mystery, and none was able to answer the questions. A thousand times a day Roland declared he had been murdered--but that assertion was not looked upon as a satisfactory answer.