nd makes way
for you. Then there's your gray mist. You take a night when there's one
of these grisly, drizzly, gray mists, and then there isn't any
particular shape to a shore. A gray mist would tangle the head of the
oldest man that ever lived. Well, then, different kinds of MOONLIGHT
change the shape of the river in different ways. You see--'

'Oh, don't say any more, please! Have I got to learn the shape of the
river according to all these five hundred thousand different ways? If I
tried to carry all that cargo in my head it would make me stoop-
shouldered.'

'NO! you only learn THE shape of the river, and you learn it with such
absolute certainty that you can always steer by the shape that's IN YOUR
HEAD, and never mind the one that's before your eyes.'

'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 t