they swing just as any other pendulums swing, at a fixed
rate, determined by their length. You can alter this by muscular
power, as you can take hold of the pendulum of a clock and make it
move faster or slower; but your ordinary gait is timed by the same
mechanism as the movements of the solar system.

[My friend, the Professor, told me all this, referring me to
certain German physiologists by the name of Weber for proof of the
facts, which, however, he said he had often verified. I
appropriated it to my own use; what can one do better than this,
when one has a friend that tells him anything worth remembering?

The Professor seems to think that man and the general powers of the
universe are in partnership. Some one was saying that it had cost
nearly half a million to move the Leviathan only so far as they had
got it already.--Why,--said the Professor,--they might have hired
an EARTHQUAKE for less money!]

Just as we find a mathematical rule at the bottom of many of the
bodily movements, just so thought may be supposed to have its
regular cycles. Such or such a thought comes round periodically,
in its turn. Accidental suggestions, however, so far interfere
with the regular cycles, that we may find them practically beyond
our power of recognition. Take all this for what it is worth, but
at any rate you will agree that there are certain particular
thoughts that do not come up once a day, nor once a week, but that
a year would hardly go round without your having them pass through
your mind. Here is one which comes up at intervals in this way.
Some one speaks of it, and there is an instant and eager smile of
assent in the listener or listeners. Yes, indeed; they have often
been struck by it.

ALL AT ONCE A CONVICTION FLASHES THROUGH US THAT WE HAVE BEEN IN
THE SAME PRECISE CIRCUMSTANCES AS AT THE PRESENT INSTANT, ONCE OR
MANY TIMES BEFORE.

O, dear, yes!--said one of the company,--everybody has had that
feeling.

The landlady didn't know anything about such notions; it was an
idee in folks' heads, she expected.

The schoolmistress said, in a hesitating sort of way, that she knew
the feeling well, and didn't like to experience it; it made her
think she was a ghost, sometimes.

The young fellow whom they call John said he knew all about it; he
had just lighted a cheroot the other day, when a tremendous
conviction all at once came over him that he had done just that
same thing ever so many times before. I