I looked and saw a gray head peering over the same gap through which Falconer had looked a few minutes before. I knew something of his personal quest by this time, and concluded at once that he thought it was or might be his father.

'I cannot leave the poor thing—I dare not,' he said.

I understood him, and darted off at full speed for the Surrey end of the bridge. What made me choose that end, I do not know; but I was right.

I had some reason to fear that I might be stopped when I reached it, as I had no business to be upon the new bridge. I therefore managed, where the upper bridge sank again towards a level with the lower, to scramble back upon it. As I did so the tall gray-headed man passed me with an uncertain step. I did not see his face. I followed him a few yards behind. He seemed to hear and dislike the sound of my footsteps, for he quickened his pace. I let him increase the distance between us, but followed him still. He turned down the river. I followed. He began to double. I doubled after him. Not a turn could he get before me. He crossed all the main roads leading to the bridges till he came to the last—when he turned toward London Bridge. At the other end, he went down the stairs into Thames Street, and held eastward still. It was not difficult to keep up with him, for his stride though long was slow. He never looked round, and I never saw his face; but I could not help fancying that his back and his gait and his carriage were very like Falconer's.

We were now in a quarter of which I knew nothing, but as far as I can guess from after knowledge, it was one of the worst districts in London, lying to the east of Spital Square. It was late, and there were not many people about.

As I passed a court, I was accosted thus:

''Ain't you got a glass of ale for a poor cove, gov'nor?'

'I have no coppers,' I said hastily. 'I am in a hurry besides,' I added as I walked on.

'Come, come!' he said, getting up with me in a moment, 'that ain't a civil answer to give a cove after his lush, that 'ain't got a blessed mag.'

As he spoke he laid his hand rather heavily on my arm. He was a lumpy-looking individual, like a groom who had been discharged for stealing his horse's provender, and had not quite worn out the clothes he had brought with him. From the opposite side at the same moment, another man appeared, low in stature, pale, and marked with the small-pox.