In the note which followed, Mr. Taggett described the difficulty he met with in procuring a key to fit the wall-door at the rear of the marble yard, and gave an account of his failure to effect an entrance into the studio. He had hoped to find a window unfastened; but the window, as well as the door opening upon the veranda, was locked, and in the midst of his operations, which were conducted at noon-time, the approach of a servant had obliged him to retreat. Forced to lay aside, at least temporarily, his designs on the workshop, he turned his attention to Richard's lodgings in Lime Street. Here Mr. Taggett was more successful. On the pretext that he had been sent for certain drawings which were to be found on the table or in a writing-desk, he was permitted by Mrs. Spooner to ascend to the bedroom, where she obligingly insisted on helping him search for the apocryphal plans, and seriously interfered with his purpose, which was to find the key of the studio. While Mr. Taggett was turning over the pages of a large dictionary, in order to gain time, and was wondering how he could rid himself of the old lady's importunities, he came upon a half-folded note-sheet, at the bottom of which his eye caught the name of Lemuel Shackford. It was in the handwriting of the dead man. Mr. Taggett was very familiar with that handwriting. He secured the paper at a venture, and put it in his pocket without examination. A few minutes later, it being impossible to prolong the pretended quest for the drawings, Mr. Taggett was obliged to follow Mrs. Spooner from the apartment. As he did so he noticed a bright object lying on the corner of the mantel-shelf,--a small nickel-plated key. In order to take it he had only to reach out his hand in passing. It was, as Mr. Taggett had instantly surmised, the key of Richard's workshop. If it had been gold, instead of brass or iron, that bit of metal would have taken no additional value in Mr. Taggett's eyes. On leaving Mrs. Spooner's he held it tightly clasped in his fingers until he reached an unfrequented street, where he halted a moment in the shadow of a building to inspect the paper, which he had half forgotten in his satisfaction at having obtained the key. A stifled cry rose to Mr. Taggett's lips as he glanced over the crumpled note-sheet. It contained three lines, hastily scrawled in lead-pencil, requesting Richard Shackford to call at the house in Welch's Court at eight o'clock on a certain Tuesday night. The note had been written, as the date showed, on the day preceding the Tuesday night in question--the night of the murder! For a second or two Mr. Taggett stood paralyzed. Ten minutes afterwards a message in cipher was pulsing along the wires to New York, and before the sun went down that evening Richard Shackford was under the surveillance of the police.