nd
it--for this might afterwards prove confusing--I carefully rub down the
vase and get rid of every thread which the caterpillars have laid on
the march. When these preparations are finished, a curious sight awaits
us.

In the interrupted circular procession there is no longer a leader.
Each caterpillar is preceded by another on whose heels he follows
guided by the silk track, the work of the whole party; he again has a
companion close behind him, following him in the same orderly way. And
this is repeated without variation throughout the length of the chain.
None commands, or rather none modifies the trail according to his
fancy; all obey, trusting in the guide who ought normally to lead the
march and who in reality has been abolished by my trickery.

From the first circuit of the edge of the tub the rail of silk has been
laid in position and is soon turned into a narrow ribbon by the
procession, which never ceases dribbling its thread as it goes. The
rail is simply doubled and has no branches anywhere, for my brush has
destroyed them all. What will the caterpillars do on this deceptive,
closed path? Will they walk endlessly round and round until their
strength gives out entirely?

The old schoolmen were fond of quoting Buridan's Ass, that famous
Donkey who, when placed between two bundles of hay, starved to death
because he was unable to decide in favour of either by breaking the
equilibrium between two equal but opposite attractions. They slandered
the worthy animal. The Ass, who is no more foolish than any one else,
would reply to the logical snare by feasting off both bundles. Will my
caterpillars show a little of his mother wit? Will they, after many
attempts, be able to break the equilibrium of their closed circuit,
which keeps them on a road without a turning? Will they make up their
minds to swerve to this side or that, which is the only method of
reaching their bundle of hay, the green branch yonder, quite near, not
two feet off?

I thought that they would and I was wrong. I said to myself:

"The procession will go on turning for some time, for an hour, two
hours, perhaps; then the caterpillars will perceive their mistake. They
will abandon the deceptive road and make their descent somewhere or
other."

That they should remain up there, hard pressed by hunger and the lack
of cover, when nothing prevented them from going away, seemed to me
inconceivable imbecility. Facts, however, forced me to accept t