-boat up-stream, and waited. Having to wait some
time, he and the officer got to talking; he looked up when he judged
that the steamer was about on the reef; saw that the buoy was gone, but
supposed that the steamer had already run over it; he went on with his
talk; he noticed that the steamer was getting very close on him, but
that was the correct thing; it was her business to shave him closely,
for convenience in taking him aboard; he was expecting her to sheer off,
until the last moment; then it flashed upon him that she was trying to
run him down, mistaking his lantern for the buoy-light; so he sang out,
'Stand by to spring for the guard, men!' and the next instant the jump
was made.

Chapter 13 A Pilot's Needs

BUT I am wandering from what I was intending to do, that is, make
plainer than perhaps appears in the previous chapters, some of the
peculiar requirements of the science of piloting. First of all, there is
one faculty which a pilot must incessantly cultivate until he has
brought it to absolute perfection. Nothing short of perfection will do.
That faculty is memory. He cannot stop with merely thinking a thing is
so and so; he must know it; for this is eminently one of the 'exact'
sciences. With what scorn a pilot was looked upon, in the old times, if
he ever ventured to deal in that feeble phrase 'I think,' instead of the
vigorous one 'I know!' One cannot easily realize what a tremendous
thing it is to know every trivial detail of twelve hundred miles of
river and know it with absolute exactness. If you will take the longest
street in New York, and travel up and down it, conning its features
patiently until you know every house and window and door and lamp-post
and big and little sign by heart, and know them so accurately that you
can instantly name the one you are abreast of when you are set down at
random in that street in the middle of an inky black night, you will
then have a tolerable notion of the amount and the exactness of a
pilot's knowledge who carries the Mississippi River in his head. And
then if you will go on until you know every street crossing, the
character, size, and position of the crossing-stones, and the varying
depth of mud in each of those numberless places, you will have some idea
of what the pilot must know in order to keep a Mississippi steamer out
of trouble. Next, if you will take half of the signs in that long
street, and CHANGE THEIR PLACES once a month, and still manage