work. He has not exaggerated this
part of the story of developments in any detail; he has set down a simple
confession.

Serenely enough he undertook the task of learning twelve hundred miles of
the great changing, shifting river as exactly and as surely by daylight
or darkness as one knows the way to his own features. As already
suggested, he had at least an inkling of what that undertaking meant. His
statement that he "supposed all that a pilot had to do was to keep his
boat in the river" is not to be accepted literally. Still he could
hardly have realized the full majesty of his task; nobody could do that
--not until afterward.

Horace Bixby was a "lightning" pilot with a method of instruction as
direct and forcible as it was effective. He was a small man, hot and
quick-firing, though kindly, too, and gentle when he had blown off. After
one rather pyrotechnic misunderstanding as to the manner of imparting and
acquiring information he said:

"My boy, you must get a little memorandum-book, and every time I tell you
a thing put it down right away. There's only one way to be a pilot, and
that is to get this entire river by heart. You have to know it just like
A B C."

So Sam Clemens got the little book, and presently it "fairly bristled"
with the names of towns, points, bars, islands, bends, and reaches, but
it made his heart ache to think that he had only half of the river set
down; for, as the "watches" were four hours off and four hours on, there
were long gaps during which he had slept.

The little note-book still exists--thin and faded, with black water-proof
covers--its neat, tiny, penciled notes still, telling, the story of that
first trip. Most of them are cryptographic abbreviations, not readily
deciphered now. Here and there is an easier line:

MERIWEATHER'S BEND

1/4 less 3--[Depth of water. One-quarter less than three
fathoms.]----run shape of upper bar and go into the low place in
willows about 200(ft.) lower down than last year.

One simple little note out of hundreds far more complicated. It would
take days for the average mind to remember even a single page of such
statistics. And those long four-hour gaps where he had been asleep, they
are still there, and somehow, after more than fifty years, the old
heart-ache is still in them. He got a new book, maybe, for the next
trip, and laid this one away.

There is but one way to account for the fact that the man whom th