-in-the-Wall,
trip before last?'

I considered this an outrage. I said--

'Every trip, down and up, the leadsmen are singing through that tangled
place for three-quarters of an hour on a stretch. How do you reckon I
can remember such a mess as that?'

'My boy, you've got to remember it. You've got to remember the exact
spot and the exact marks the boat lay in when we had the shoalest water,
in everyone of the five hundred shoal places between St. Louis and New
Orleans; and you mustn't get the shoal soundings and marks of one trip
mixed up with the shoal soundings and marks of another, either, for
they're not often twice alike. You must keep them separate.'

When I came to myself again, I said--

'When I get so that I can do that, I'll be able to raise the dead, and
then I won't have to pilot a steamboat to make a living. I want to
retire from this business. I want a slush-bucket and a brush; I'm only
fit for a roustabout. I haven't got brains enough to be a pilot; and if
I had I wouldn't have strength enough to carry them around, unless I
went on crutches.'

'Now drop that! When I say I'll learn {footnote ['Teach' is not in the
river vocabulary.]} a man the river, I mean it. And you can depend on
it, I'll learn him or kill him.'

Chapter 9 Continued Perplexities

THERE was no use in arguing with a person like this. I promptly put
such a strain on my memory that by and by even the shoal water and the
countless crossing-marks began to stay with me. But the result was just
the same. I never could more than get one knotty thing learned before
another presented itself. Now I had often seen pilots gazing at the
water and pretending to read it as if it were a book; but it was a book
that told me nothing. A time came at last, however, when Mr. Bixby
seemed to think me far enough advanced to bear a lesson on water-
reading. So he began--

'Do you see that long slanting line on the face of the water? Now,
that's a reef. Moreover, it's a bluff reef. There is a solid sand-bar
under it that is nearly as straight up and down as the side of a house.
There is plenty of water close up to it, but mighty little on top of it.
If you were to hit it you would knock the boat's brains out. Do you see
where the line fringes out at the upper end and begins to fade away?'

'Yes, sir.'

'Well, that is a low place; that is the head of the reef. You can climb
over there, and not hurt anything. Cross over, now, and foll