“Ah, well, there is no great mystery in that. But you will know all about it soon enough. How sweet the morning air is! See how that one little cloud floats like a pink feather from some gigantic flamingo. Now the red rim of the sun pushes itself over the London cloud-bank. It shines on a good many folk, but on none, I dare bet, who are on a stranger errand than you and I. How small we feel with our petty ambitions and strivings in the presence of the great elemental forces of Nature! Are you well up in your Jean Paul?”

“Fairly so. I worked back to him through Carlyle.”

“That was like following the brook to the parent lake. He makes one curious but profound remark. It is that the chief proof of man’s real greatness lies in his perception of his own smallness. It argues, you see, a power of comparison and of appreciation which is in itself a proof of nobility. There is much food for thought in Richter. You have not a pistol, have you?”

“I have my stick.”

“It is just possible that we may need something of the sort if we get to their lair. Jonathan I shall leave to you, but if the other turns nasty I shall shoot him dead.”

He took out his revolver as he spoke, and, having loaded two of the chambers, he put it back into the right-hand pocket of his jacket.

We had during this time been following the guidance of Toby down the half-rural villa-lined roads which lead to the metropolis. Now, however, we were beginning to come among continuous streets, where labourers and dockmen were already astir, and slatternly women were taking down shutters and brushing door-steps. At the square-topped corner public-houses business was just beginning, and rough-looking men were emerging, rubbing their sleeves across their beards after their morning wet. Strange dogs sauntered up and stared wonderingly at us as we passed, but our inimitable Toby looked neither to the right nor to the left but trotted onward with his nose to the ground and an occasional eager whine which spoke of a hot scent.

We had traversed Streatham, Brixton, Camberwell, and now found ourselves in Kennington Lane, having borne away through the side streets to the east of the Oval. The men whom we pursued seemed to have taken a curiously zigzag road, with the idea probably of escaping observation. They had never kept to the main road if a parallel side street would serve their turn. At the foot of Kennington Lane they had edged away to the left through Bond Street and Miles Street. Where the latter street turns into Knight’s Place, Toby ceased to advance but began to run backward and forward with one ear cocked and the other drooping, the very picture of canine indecision. Then he waddled round in circles, looking up to us from time to time, as if to ask for sympathy in his embarrassment.

“What the deuce is the matter with the dog?” growled Holmes. “They surely would not take a cab or go off in a balloon.”

“Perhaps they stood here for some time,” I suggested.

“Ah! it’s all right. He’s off again,” said my companion in a tone of relief.

He was indeed off, for after sniffing round again he suddenly made up his mind and darted away with an energy and determination such as he had not yet shown. The scent appeared to be much hotter than 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.