Number One has had the misfortune to tread in the creosote.

You can see the outline of the edge of his small foot here at the side of this evil-smelling mess.

The carboy has been cracked, You see, and the stuff has leaked out." "What then ?" I asked.
"Why, we have got him, that's all," said he.

"I know a dog that would follow that scent to the world's end.

If a pack can track a trailed herring across a shire, how far can a specially-trained hound follow so pungent a smell as this?
It sounds like a sum in the rule of three.
The answer should give us the--But halloo! here are the accredited representatives of the law." Heavy steps and the clamor of loud voices were audible from below, and the hall door shut with a loud crash.
"Before they come," said Holmes, "just put your hand here on this poor fellow's arm, and here on his leg.