could take a boat down to New Orleans if I could make her skip those
little gaps. But of course my complacency could hardly get start enough
to lift my nose a trifle into the air, before Mr. Bixby would think of
something to fetch it down again. One day he turned on me suddenly with
this settler--

'What is the shape of Walnut Bend?'

He might as well have asked me my grandmother's opinion of protoplasm. I
reflected respectfully, and then said I didn't know it had any
particular shape. My gunpowdery chief went off with a bang, of course,
and then went on loading and firing until he was out of adjectives.

I had learned long ago that he only carried just so many rounds of
ammunition, and was sure to subside into a very placable and even
remorseful old smooth-bore as soon as they were all gone. That word
'old' is merely affectionate; he was not more than thirty-four. I
waited. By and by he said--

'My boy, you've got to know the SHAPE of the river perfectly. It is all
there is left to steer by on a very dark night. Everything else is
blotted out and gone. But mind you, it hasn't the same shape in the
night that it has in the day-time.'

'How on earth am I ever going to learn it, then?'

'How do you follow a hall at home in the dark. Because you know the
shape of it. You can't see it.'

'Do you mean to say that I've got to know all the million trifling