’Very well, I’ll try it; but after I have learned it can I depend on it.  Will it keep the same form and not go fooling around?’

Before Mr. Bixby could answer, Mr. W——­ came in to take the watch, and he said—­

’Bixby, you’ll have to look out for President’s Island and all that country clear away up above the Old Hen and Chickens.  The banks are caving and the shape of the shores changing like everything.  Why, you wouldn’t know the point above 40.  You can go up inside the old sycamore-snag, now.{footnote [1.  It may not be necessary, but still it can do no harm to explain that ‘inside’ means between the snag and the shore.—­ M.T.]}

So that question was answered.  Here were leagues of shore changing shape.  My spirits were down in the mud again.  Two things seemed pretty apparent to me.  One was, that in order to be a pilot a man had got to learn more than any one man ought to be allowed to know; and the other was, that he must learn it all over again in a different way every twenty-four hours.

That night we had the watch until twelve.  Now it was an ancient river custom for the two pilots to chat a bit when the watch changed.  While the relieving pilot put on his gloves and lit his cigar, his partner, the retiring pilot, would say something like this—­

’I judge the upper bar is making down a little at Hale’s Point; had quarter twain with the lower lead and mark twain {footnote [Two fathoms.  ‘Quarter twain’ is two-and-a-quarter fathoms, thirteen-and-a-half feet.  ‘Mark three’ is three fathoms.]} with the other.’

‘Yes, I thought it was making down a little, last trip.  Meet any boats?’

’Met one abreast the head of 21, but she was away over hugging the bar, and I couldn’t make her out entirely.  I took her for the “Sunny South"- -hadn’t any skylights forward of the chimneys.’

And so on.  And as the relieving pilot took the wheel his partner{footnote [’Partner’ is a technical term for ’the other pilot’.]} would mention that we were in such-and-such a bend, and say we were abreast of such-and-such a man’s wood-yard or plantation.  This was courtesy; I supposed it was necessity.  But Mr. W——­ came on watch full twelve minutes late on this particular night,—­a tremendous breach of etiquette; in fact, it is the unpardonable sin among pilots.  So Mr. Bixby gave him no greeting whatever, but simply surrendered the wheel and marched out of the pilot-house without a word.  I was appalled; it was a villainous night for blackness, we were in a particularly wide and blind part of the river, where there was no shape or substance to anything, and it seemed incredible that Mr. Bixby should have left that poor fellow to kill the boat trying to find out where he was.  But I resolved that I would stand by him any way.  He should find that he was not wholly friendless.  So I stood around, and waited to be asked where we were.  But Mr. W——­ plunged on serenely through the solid firmament of black cats