I do not think I made any reply; for I had a sudden, queer feeling that the thing was not right. And then, in a minute, I called myself an ass; but I could not really shake off the feeling. I had another good look at the sea. I had a vague idea that something was different. The sea looked brighter, somehow, and the air clearer, I thought, and I missed something; but not much, you know. And it was not until a couple of days later, that I knew that it was several vessels on the horizon, which had been quite in sight before the mist, and now were gone. During the rest of the watch, and indeed all day, there was no further sign of anything unusual. Only, when the evening came (in the second dog-watch it was) I saw the mist rise faintly--the setting sun shining through it, dim and unreal. I knew then, as a certainty, that it was not caused by heat. And that was the beginning of it. The next day, I kept a pretty close watch, during all my time on deck; but the atmosphere remained clear. Yet, I heard from one of the chaps in the Mate's watch, that it had been hazy during part of the time he was at the wheel. "Comin' an' goin', like," he described it to me, when I questioned him about it. He thought it might be heat. But though I knew otherwise, I did not contradict him. At that time, no one, not even Plummer, seemed to think very much of the matter. And when I mentioned it to Tammy, and asked him whether he'd noticed it, he only remarked that it must have been heat, or else the sun drawing up water. I let it stay at that; for there was nothing to be gained by suggesting that the thing had more to it. Then, on the following day, something happened that set me wondering more than ever, and showed me how right I had been in feeling the mist to be something unnatural. It was in this way. Five bells, in the eight to twelve morning watch, had gone. I was at the wheel. The sky was perfectly clear--not a cloud to be seen, even on the horizon. It was hot, standing at the wheel; for there was scarcely any wind, and I was feeling drowsy. The Second Mate was down on the maindeck with the men, seeing about some job he wanted done; so that I was on the poop alone.