instance?"
"That is number six; but the house opposite Mr. Hartridge's rooms is number eight."
"Thank you."
Thorndyke was moving away, but suddenly turned again to the porter.
"By the way," said he, "I dropped something out of the window just now—a small flat piece of metal, like this." He made on the back of his visiting card a neat sketch of a circular disc, with a hexagonal hole through it, and handed the card to the porter. "I can't say where it fell," he continued; "these flat things scale about so; but you might ask the gardener to look for it. I will give him a sovereign if he brings it to my chambers, for, although it is of no value to anyone else, it is of considerable value to me."
The porter touched his hat briskly, and as we turned out at the gate, I looked back and saw him already wading among the shrubs.
The object of the porter's quest gave me considerable mental occupation. I had not seen Thorndyke drop any thing, and it was not his way to finger carelessly any object of value. I was about to question him on the subject, when, turning sharply round into Cotman Street, he drew up at the doorway of number six, and began attentively to read the names of the occupants.
"'Third-floor,'" he read out, "'Mr. Thomas Barlow, Commission Agent.' Hum! I think we will look in on Mr. Barlow."
He stepped quickly up the stone stairs, and I followed, until we arrived, somewhat out of breath, on the third-floor. Outside the Commission Agent's door he paused for a moment, and we both listened curiously to an irregular sound of shuffling feet from within. Then he softly opened the door and looked into the room. After remaining thus for nearly a minute, he looked round at me with a broad smile, and noiselessly set the door wide open. Inside, a lanky youth of fourteen was practising, with no mean skill, the manipulation of an appliance known by the appropriate name of diabolo; and so absorbed was he in his occupation that we entered and shut the door without being observed. At length the shuttle missed the string and flew into a large waste-paper basket; the boy turned and confronted us, and was instantly covered with confusion.
"Allow me," said Thorndyke, rooting rather unnecessarily in the waste-paper basket, and handing the toy to its owner. "I need not ask if Mr. Barlow is in," he added, "nor if he is likely to return shortly."
"He won't be back to-day," said the boy, perspiring with embarrassment; "he left before I came. I was rather late."
"I see," said Thorndyke. "The early bird catches the worm, but the late bird catches the diabolo. How did you know he would not be back?"
"He left a note. Here it is."
He exhibited the document, which was neatly written in red ink. Thorndyke examined it attentively, and then asked:
"Did you break the inkstand yesterday?"
The boy stared at him in amazement. "Yes, I did," he answered. "How did you know?"
"I didn't, or I should not have asked. But I see that he has used his stylo to write this note."
The boy regarded Thorndyke distrustfully, as he continued:
"I really called to see if your Mr. Barlow was a gentleman whom I used to know; but I expect you can tell me. My friend was tall and thin, dark, and clean-shaved."
"This ain't him, then," said the boy. "He's thin, but he ain't tall or dark. He's got a sandy beard, and he wears spectacles and a wig. I know a wig when I see one," he added cunningly, "'cause my father wears one. He puts it on a peg to comb it, and he swears at me when I larf."
"My friend had injured his left hand," pursued Thorndyke.
"I dunno about that," said the youth. "Mr. Barlow nearly always wears gloves; he always wears one on his left hand, anyhow."
"Ah well! I'll just write him a note on the chance, if you will give me a piece of notepaper. Have you any ink?"
"There's some in the bottle. I'll dip the pen in for you."
He produced, from the cupboard, an opened packet of cheap notepaper and a packet of similar envelopes, and, having dipped the pen to the bottom of the ink-bottle, handed it to Thorndyke, who sat down and hastily scribbled a short note. He had folded the paper, and was about to address the envelope, when he appeared suddenly to alter his mind.
"I don't think I will leave it, after all," he said, slipping the folded paper into his pocket. "No. Tell him I called—Mr. Horace Budge—and say I will look in again in a day or two."
The youth watched our exit with an air of perplexity, and he even came out on to the landing, the better to observe us over the balusters; until, unexpectedly catching Thorndyke's eye, he withdrew his head with remarkable suddenness, and retired in disorder.
To tell the truth, I was now little less perplexed than the office-boy by Thorndyke's proceedings; in which I could discover no relevancy to the investigation that I presumed he was engaged upon: and the last straw was laid upon the burden of my curiosity when he stopped at a staircase window, drew the note out of his pocket, examined it with his lens, held it up to the light, and chuckled aloud.
"Luck," he observed, "though no substitute for care and intelligence, is a very pleasant addition. Really, my learned brother, we are doing uncommonly well."
When we reached the hall, Thorndyke stopped at the housekeeper's box, and looked in with a genial nod.
"I have just been up to see Mr. Barlow," said he. "He seems to have left quite early."
"Yes, sir," the man replied. "He went away about half-past eight."
"That was very early; and presumably he came earlier still?"
"I suppose so," the man assented, with a grin; "but I had only just come on when he left."
"Had he any luggage with him?"
"Yes, sir. There was two cases, a square one and a long, narrow one, about five foot long. I helped him to carry them down to the cab."
"Which was a four-wheeler, I suppose?"
"Yes, sir."
"Mr. Barlow hasn't been here very long, has he?" Thorndyke inquired.
"No. He only came in last quarter-day—about six weeks ago."
"Ah well! I must call another day. Good-morning;" and Thorndyke strode out of the building, and made directly for the cab-rank in the adjoining street. Here he stopped for a minute or two to parley with the driver of a four-wheeled cab, whom he finally commissioned to convey us to a shop in New Oxford Street. Having dismissed the cabman with his blessing and a half-sovereign, he vanished into the shop, leaving me to gaze at the lathes, drills, and bars of metal displayed in the window. Presently he emerged with a small parcel, and explained, in answer to my inquiring look: "A strip of tool steel and a block of metal for Polton."
His next purchase was rather more eccentric. We were proceeding along Holborn when his attention was suddenly arrested by the window of a furniture shop, in which was displayed a collection of obsolete French small-arms—relics of the tragedy of 1870—which were being sold for decorative purposes. After a brief inspection, he entered the shop, and shortly reappeared carrying a long sword-bayonet and an old Chassepôt rifle.
"What
