a changing channel there; the lines and circles in
the slick water over yonder are a warning that that troublesome place is
shoaling up dangerously; that silver streak in the shadow of the forest
is the 'break' from a new snag, and he has located himself in the very
best place he could have found to fish for steamboats; that tall dead
tree, with a single living branch, is not going to last long, and
then how is a body ever going to get through this blind place at night
without the friendly old landmark.

No, the romance and the beauty were all gone from the river. All the
value any feature of it had for me now was the amount of usefulness it
could furnish toward compassing the safe piloting of a steamboat. Since
those days, I have pitied doctors from my heart. What does the lovely
flush in a beauty's cheek mean to a doctor but a 'break' that ripples
above some deadly disease. Are not all her visible charms sown thick
with what are to him the signs and symbols of hidden decay? Does he ever
see her beauty at all, or doesn't he simply view her professionally, and
comment upon her unwholesome condition all to himself? And doesn't he
sometimes wonder whether he has gained most or lost most by learning his
trade?

Chapter 10 Completing My Education

WHOSOEVER has done me the courtesy to read my chapters which have
preceded this may possibly wonder that I deal so minutely with piloting
as a science. It was the prime purpose of those chapters; and I am not
quite done yet. I wish to show, in the most patient and painstaking way,
what a wonderful science it is. Ship channels are buoyed and lighted,
and therefore it is a comparatively easy undertaking to learn to run
them; clear-water rivers, with gravel bottoms, change their channels
very gradually, and therefore one needs to learn them but once; but
piloting becomes another matter when you apply it to vast streams like
the Mississippi and the Missouri, whose alluvial banks cave and change
constantly, whose snags are always hunting up new quarters, whose
sandbars are never at rest, whose channels are for ever dodging and
shirking, and whose obstructions must be confronted in all nights and
all weathers without the aid of a single light-house or a single buoy;
for there is neither light nor buoy to be found anywhere in all this
three or four thousand miles of villainous river.{footnote [True at the
time referred to; not true now (1882).]} I feel justified in enlarging
upo