“Well, when I came to examine the box I found there was no money in it, and nothing but papers that I would not dare to sell.  I had lost my hold on Black Peter and was stranded in London without a shilling.  There was only my trade left.  I saw these advertisements about harpooners, and high wages, so I went to the shipping agents, and they sent me here.  That’s all I know, and I say again that if I killed Black Peter, the law should give me thanks, for I saved them the rice of a hempen rope.”

“A very clear statement said Holmes,” rising and lighting his pipe.  “I think, Hopkins, that you should lose no time in conveying your prisoner to a place of safety.  This room is not well adapted for a cell, and Mr. Patrick Cairns occupies too large a proportion of our carpet.”

“Mr. Holmes,” said Hopkins, “I do not know how to express my gratitude.  Even now I do not understand how you attained this result.”

“Simply by having the good fortune to get the right clue from the beginning.  It is very possible if I had known about this notebook it might have led away my thoughts, as it did yours.  But all I heard pointed in the one direction.  The amazing strength, the skill in the use of the harpoon, the rum and water, the sealskin tobacco-pouch with the coarse tobacco—­all these pointed to a seaman, and one who had been a whaler.  I was convinced that the initials ‘P.C.’ upon the pouch were a coincidence, and not those of Peter Carey, since he seldom smoked, and no pipe was found in his cabin.  You remember that I asked whether whisky and brandy were in the cabin.  You said they were.  How many landsmen are there who would drink rum when they could get these other spirits?  Yes, I was certain it was a seaman.”

“And how did you find him?”

“My dear sir, the problem had become a very simple one.  If it were a seaman, it could only be a seaman who had been with him on the sea Unicorn.  So far as I could learn he had sailed in no other ship.  I spent three days in wiring to Dundee, and at the end of that time I had ascertained the names of the crew of the sea Unicorn in 1883.  When I found Patrick Cairns among the harpooners, my research was nearing its end.  I argued that the man was probably in London, and that he would desire to leave the country for a time.  I therefore spent some days in the East End, devised an Arctic expedition, put forth tempting terms for harpooners who would serve under Captain Basil—­and behold the result!”

“Wonderful!” cried Hopkins.  “Wonderful!”

“You must obtain the release of young Neligan as soon as possible,” said Holmes.  “I confess that I think you owe him some apology.  The tin box must be returned to him, but, of course, the securities which Peter Carey has sold are lost forever.  There’s the cab, Hopkins, and you can remove your man.  If you want me for the trial, my address and that of Watson will be somewhere in Norway—­I’ll send particulars later.”