All of a sudden he stepped firmly to the sally-port, swiftly unlashed from the iron top-rail a mop, and threw it overboard. Then he set about unlashing a second article of the same species.

"Hi!" I shouted to him. "What are you doing there?"

With a start the man turned round, clapped a hand to his forehead to discover my whereabouts, and replied softly and rapidly, and with a stammer in his voice:

"How is that your business? Get away with you!"

Upon this I approached him, for I was astonished and amused at his impudence.

"For what you have done the sailors will make you pay right enough," I remarked.

He tucked up the sleeves of his pea-jacket as though he were preparing for a fight. Then, stamping his foot upon the slippery grating, he muttered:

"I perceived the mop to have come untied, and to be in danger of falling into the water through the vibration. Upon that I tried to secure it, and failed, for it slipped from my hands as I was doing so."

"But," I remarked in amazement, "my belief is that you WILLFULLY untied the mop, to throw it overboard!"

"Come, come!" he retorted. "Why should I have done that? What an extraordinary thing it would have been to do! How could it have been possible?"