of mirth.  At last I ventured a home-thrust.  I determined to commence a series of covert insinuations, or innuendoes, about the oblong box—­just to let him perceive, gradually that I was not altogether the butt, or victim, of his little bit of pleasant mystification.  My first observation was by way of opening a masked battery.  I said something about the “peculiar shape of that box;” and, as I spoke the words, I smiled knowingly, winked, and touched him gently with my fore-finger in the ribs.

The manner in which Wyatt received this harmless pleasantry convinced me, at once, that he was mad.  At first he stared at me as if he found it impossible to comprehend the witticism of my remark; but as its point seemed slowly to make its way into his brain, his eyes, in the same proportion, seemed protruding from their sockets.  Then he grew very red—­then hideously pale—­then, as if highly amused with what I had insinuated, he began a loud and boisterous laugh, which, to my astonishment, he kept up, with gradually increasing vigor, for ten minutes or more.  In conclusion he fell flat and heavily upon the deck.  When I ran to uplift him, to all appearance he was dead.

I called assistance, and, with much difficulty, we brought him to himself.  Upon reviving he spoke incoherently for some time.  At length we bled him and put him to bed.  The next morning he was quite recovered, so far as regarded his mere bodily health.  Of his mind I say nothing, of course.  I avoided him during the rest of the passage, by advice of the captain, who seemed to coincide with me altogether in my views of his insanity, but cautioned me to say nothing on this head to any person on board.

Several circumstances occurred immediately after this fit of Wyatt’s which contributed to heighten the curiosity with which I was already possessed.  Among other things, this:  I had been nervous—­drank too much strong green tea, and slept ill at night—­in fact, for two nights I could not be properly said to sleep at all.  Now, my stateroom opened into the main cabin, or dining-room, as did those of all the single men on board.  Wyatt’s three rooms were in the after-cabin, which was separated from the main one by a slight sliding door, never locked even at night.  As we were almost constantly on a wind, and the breeze was not a little stiff, the ship heeled to leeward very considerably; and whenever her starboard side was to leeward, the sliding door between the cabins slid open, and so remained, nobody taking the trouble to get up and shut it.  But my berth was in such a position, that when my own stateroom door was open, as well as the sliding door in question (and my own door was always open on account of the heat), I could see into the after-cabin quite distinctly, and just at that portion of it, too, where were situated the staterooms of Mr. Wyatt.  Well, during two nights (not consecutive) while I lay awake, I clearly saw Mrs. W., about eleven o’clock each night, steal cautiously from the stateroom of Mr. W., and enter the extra room, where she remained until daybreak, when she was called by her husband and went back.  That they were virtually separated was clear.  They had separate apartments—­no doubt in contemplation of a more permanent divorce; and here, after all, I thought, was the mystery of the extra stateroom.