They heard the thud of his feet as he alit on her short fore-deck, and an instant later, as he leaned over the stem and gripped Dr.Glasson's coat-collar, the light of the bobbing lantern showed them his face.

It was Sam Bossom.
He had lifted the Doctor waist-high from the water before the other helpers sprang on board and completed the rescue.

The poor man was hauled over the bows and stretched on the fore-deck, where he lay groaning while they brought the boat alongside the quay's edge.

By this time a small crowd had gathered, and was being pressed back from the brink and exhorted by a belated policeman.
It appeared as they lifted him ashore that the Doctor, beside the inconvenience of a stomachful of dirty canal water, was suffering considerable pain.

In his fright (the dog had not actually bitten him) he had blundered, and struck his knee-cap violently against a bollard close by the water's edge, and staggering under the anguish of it, had lost his footing and collapsed overboard.