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where Dubonnet was actively map
ping out his mathematical cam
paign. "Yes, sir. But that fellow Dubonnet
I don't know what to do with him.
Look at him now! He's drawing dia
grams and seems totally ignorant
. that a charge is about to begin,"
t "Leave the poor devil. He'd only
discourage the rest," thecaptain an
In the trenches opposite Capt.
Schmidt was twirling his mustache
fiercely as he addressed Lieutenant
"The shelling has ceased; I think
the French are going to charge," he
said. "Are your men ready?"
"All except that fool of a Muller,"
replied the young officer. "I don't
know what to do with him. Look at
him now," scribbling there as if the
war was over, or hadn't begun."
"Leave him alone. Perhaps he',11
get killed and we'll be rid of him,"
the other answered.
At that moment a whistle blew in
the trenches opposite. The French
scrambled over the parapet of their
trench, and, with fixed bayonets,
rushed madly forward. The Germans,
equally impetuous, stood up to re
ceive them. In a few seconds the
two lines were inextricably interwov
en. -To and fro they swayed upon
i the parapet of the German trench.
Prof. Dubonnet, wholly forgetful
of the signs of battle, worked busily
at his problem. He had a new solu
tion which had never occurred to'
him before. If it was tangental to a,
fixed point on a parabola, would not'
Epperman's formula solve the whole
Herr Muller, formerly professor at
Jena, haci a brilliant inspiration The
relation of the radii must vary in in
verse relationship to the segment in
tersected by the no, there, he
had got off the track. Hie bent,
frowning, to his work. The body of
a dead soldier dropped with a thud
into the trench beside him. He
phook his head impatiently.
"A little less noise, please, gentle-!
men," he muttered. "Do not slam
the door whan you go out, even if
you disapprove of my exposition."
He had stood up as if in the class
room and was now declaiming vio
lently, the piece of board in his hand.
The struggle had moved away from;
him, and by luck, none of the flying
builets came his way.
"I have it!" shrieked Prof. Dubon
net. "Epperman's formula has,
solved the problem." He sprang to
his feet "This means the opening
of a new era in mathematics!" he
cried. "What wouldn't I give to see
that ass, Muller, now, who thinks he
has the solution!"
At that moment, to his amazement,
he saw Muller's face across the inter
vening space. He raised his fist and
shook it angrily. The movement
caught. Muller's jeye.
"Gentlemen, please be less violent
in your disapproval," he said. I can
not hope to carry conviction at the
first attempt. Copernicus, as you
are jjware "
He paused and looked about him.
"But where am I?" he inquired.
"There seems to be some disturb
At that instant he saw Dubonnet
running full speed across the inter
vening ground. Meanwhile the Ger
mans, repulsed from their trench,
had withdrawn, ahd the French were
following them, firing and hurling
"It is you, scoundrel!" screamed
Prof. Muller, shaking his first at his
enemy. "Is it not enough that you
should oppose the march of mathe
matics, but yo;i must also- creafe a
disturbance in my classroom?"
'With a yell Dubonent leaped into
the trench. "It's Epperman's for
mula," 'he shouted. "I tell you Epper
man's does it." "
"Nonsense. You can't solve it by a
formula," said Muller. "Don't you
see it depends upon the relationship
He rolled over, still clutching the