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 before, for he had not even to put his nose on the ground, but tugged at his leash and tried to break into a run. I could see by the gleam in Holmes’s eyes that he thought we were nearing the end of our journey.

Our course now ran down Nine Elms until we came to Broderick and Nelson’s large timber-yard, just past the White Eagle tavern. Here the dog, frantic with excitement, turned down through the side-gate into the enclosure, where the sawyers were already at work. On the dog raced through sawdust and shavings, down an alley, round a passage, between two wood-piles, and finally, with a triumphant yelp, sprang upon a large barrel which still stood upon the hand-trolley on which it had been brought. With lolling tongue and blinking eyes, Toby stood upon the cask, looking from one to the other of us for some sign of appreciation. The staves of the barrel and the wheels of the trolley were smeared with a dark liquid, and the whole air was heavy with the smell of creasote.

Sherlock Holmes and I looked blankly at each other, and then burst simultaneously into an uncontrollable fit of laughter.

“ now?” I asked. “Toby has lost his character for infallibility.”

“He acted according to his lights,” said Holmes, lifting him down from the barrel and walking him out of the timber-yard. “If you consider how much creasote is carted about London in one day, it is no great wonder that our trail should have been crossed. It is much used now, especially for the seasoning of wood. Poor Toby is not to blame.”

“We must get on the main scent again, I suppose.”

“Yes. And, fortunately, we have no distance to go. Evidently what puzzled the dog at the corner of Knight’s Place was that there were two different trails running in opposite directions. We took the wrong one. It only remains to follow the other.”

There was no difficulty about this. On leading Toby to the place where he had committed his fault, he cast about in a wide circle and finally dashed off in a fresh direction.

“We must take care that he does not now bring us to the place where the creasote-barrel came from,” I observed.

“I had thought of that. But you notice that he keeps on the pavement, whereas the barrel passed down the roadway. No, we are on the true scent now.”

It tended down towards the river-side, running through Belmont Place and Prince’s Street. At the end of Broad Street it ran right down to the water’s edge, where there was a small wooden wharf. Toby led us to the very edge of this, and there stood whining, looking out on the dark current beyond.

“We are out of luck,” said Holmes. “They have taken to a boat