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"Possibly, if we could prove a bicycle to have been in his possession. But this we have utterly failed to do. This track, as you perceive, was made by a rider who was going from the direction of the school."

"Or towards it?"

"No, no, my dear Watson.

The more deeply sunk impression is, of course, the hind wheel, upon which the weight rests.

You perceive several places where it has passed across and obliterated the more shallow mark of the front one.

It was undoubtedly heading away from the school.

It may or may not be connected with our inquiry, but we will follow it backwards before we go any farther."

We did so, and at the end of a few hundred yards lost the tracks as we emerged from the boggy portion of the moor.

Following the path backwards, we picked out another spot, where a spring trickled across it.

Here, once again, was the mark of the bicycle, though nearly obliterated by the hoofs of cows.

After that there was no sign, but the path ran right on into Ragged Shaw, the wood which backed on to the school.

From this wood the cycle must have emerged.

Holmes sat down on a boulder and rested his chin in his hands.

I had smoked two cigarettes before he moved.

"Well, well," said he, at last.

"It is, of course, possible that a cunning man might change the tyre of his bicycle in order to leave unfamiliar tracks.

A criminal who was capable of such a thought is a man whom I should be proud to do business with.

We will leave this question undecided and hark back to our morass again, for we have left a good deal unexplored."

We continued our systematic survey of the edge of the sodden portion of the moor, and soon our perseverance was gloriously rewarded.

Right across the lower part of the bog lay a miry path.

Holmes gave a cry of delight as he approached it.

An impression like a fine bundle of telegraph wires ran down the centre of it.

It was the Palmer tyre.

"Here is Herr Heidegger, sure enough!" cried Holmes, exultantly. "My reasoning seems to have been pretty sound, Watson."

"I congratulate you."

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