in flood-time, by
turning its surplus waters off into Lake Borgne, etc.

5. Some believed in the scheme of northern lake-reservoirs to replenish
the Mississippi in low-water seasons.

Wherever you find a man down there who believes in one of these theories
you may turn to the next man and frame your talk upon the hypothesis
that he does not believe in that theory; and after you have had
experience, you do not take this course doubtfully, or hesitatingly, but
with the confidence of a dying murderer--converted one, I mean. For you
will have come to know, with a deep and restful certainty, that you are
not going to meet two people sick of the same theory, one right after
the other. No, there will always be one or two with the other diseases
along between. And as you proceed, you will find out one or two other
things. You will find out that there is no distemper of the lot but is
contagious; and you cannot go where it is without catching it. You may
vaccinate yourself with deterrent facts as much as you please--it will
do no good; it will seem to 'take,' but it doesn't; the moment you rub
against any one of those theorists, make up your mind that it is time to
hang out your yellow flag.

Yes, you are his sure victim: yet his work is not all to your hurt--
only part of it; for he is like your family physician, who comes and
cures the mumps, and leaves the scarlet-fever behind. If your man is a
Lake-Borgne-relief theorist, for instance, he will exhale a cloud of
deadly facts and statistics which will lay you out with that disease,
sure; but at the same time he will cure you of any other of the five
theories that may have previously got into your system.

I have had all the five; and had them 'bad;' but ask me not, in mournful
numbers, which one racked me hardest, or which one numbered the biggest
sick list, for I do not know. In truth, no one can answer the latter
question. Mississippi Improvement is a mighty topic, down yonder. Every
man on the river banks, south of Cairo, talks about it every day, during
such moments as he is able to spare from talking about the war; and each
of the several chief theories has its host of zealous partisans; but, as
I have said, it is not possible to determine which cause numbers the
most recruits.

All were agreed upon one point, however: if Congress would make a
sufficient appropriation, a colossal benefit would result. Very well;
since then the appropriation has been made--possi