building which was fenced about with a
thick, rusty chain, which sagged from post to post in a succession of
low swings. The pavement, here, was made of heavy blocks of stone. In
the glare of the moon a party of barefooted children were swinging on
those chains and having a noisy good time. They were not the first ones
who have done that; even their great-great-grandfathers had not been the
first to do it when they were children. The strokes of the bare feet
had worn grooves inches deep in the stone flags; it had taken many
generations of swinging children to accomplish that.

Everywhere in the town were the mold and decay that go with antiquity,
and evidence of it; but I do not know that anything else gave us so
vivid a sense of the old age of Heilbronn as those footworn grooves in
the paving-stones.

CHAPTER XIII

[My Long Crawl in the Dark]

When we got back to the hotel I wound and set the pedometer and put
it in my pocket, for I was to carry it next day and keep record of the
miles we made. The work which we had given the instrument to do during
the day which had just closed had not fatigued it perceptibly.

We were in bed by ten, for we wanted to be up and away on our tramp
homeward with the dawn. I hung fire, but Harris went to sleep at once.
I hate a man who goes to sleep at once; there is a sort of indefinable
something about it which is not exactly an insult, and yet is an
insolence; and one which is hard to bear, too. I lay there fretting
over this injury, and trying to go to sleep; but the harder I tried, the
wider awake I grew. I got to feeling very lonely in the dark, with no
company but an undigested dinner. My mind got a start by and by, and
began to consider the beginning of every subject which has ever been
thought of; but it never went further than the beginning; it was touch
and go; it fled from topic to topic with a frantic speed. At the end of
an hour my head was in a perfect whirl and I was dead tired, fagged out.

The fatigue was so great that it presently began to make some head
against the nervous excitement; while imagining myself wide awake, I
would really doze into momentary unconsciousness, and come suddenly out
of it with a physical jerk which nearly wrenched my joints apart--the
delusion of the instant being that I was tumbling backward over a
precipice. After I had fallen over eight or nine precipices and thus
found out that one half of my brain had been asleep eight or