"Sir," said he, "I want to ask a favour of you."

I answered that I would do anything to oblige him.

"Your room-mate has disappeared," he said. "He is known to have turned in early last night. Did you notice anything extraordinary in his manner?"

The question coming, as it did, in exact confirmation of the fears the doctor had expressed half an hour earlier, staggered me.

"You don't mean to say he has gone overboard?" I asked.

"I fear he has," answered the captain.

"This is the most extraordinary thing——" I began.

"Why?" he asked.

"He is the fourth, then?" I explained. In answer to another question from the captain, I explained, without mentioning the doctor, that I had heard the story concerning one hundred and five. He seemed very much annoyed at hearing that I knew of it. I told him what had occurred in the night.

"What you say," he replied, "coincides almost exactly with what was told me by the room-mates of two of the other three. They bolt out of bed and run down the passage. Two of them were seen to go overboard by the watch; we stopped and lowered boats, but they were not found. Nobody, however, saw or heard the man who was lost last night—if he is really lost. The steward, who is a superstitious fellow, perhaps, and expected something to go wrong, went to look for him this morning, and found his berth empty, but his clothes lying about, just as he had left them. The steward was the only man on board who knew him by sight, and he has been searching everywhere for him. He has disappeared! Now, sir, I want to beg you not to mention the circumstance to any of the passengers; I don't want the ship to get a bad name, and nothing hangs about an ocean-goer like stories of suicides. You shall have your choice of any one of the officers' cabins you like, including my own, for the rest of the passage. Is that a fair bargain?"