some three miles, then turned abruptly off into the forest.

For another half mile they kept on, going further and further from
the road.

"Here's the spot," said Mock, after some hunting under the trees.
"It must be the place, for it has the nail driven into the tree
trunk."

"Sure, it's the place all right," Wilhelm agreed.

Mock emitted a shrill whistle that would not, however, carry very
far. Instantly there came an answering whistle.

"And here we are!" spoke up the stoop-shouldered stranger, coming
out of a. jungle of bushes. "I'm glad to see that you're on
time. And to-day I hope you've more sand than you had that night."

"Forget it," said Mock shortly.

"You're ready now?"

"To do anything," Mock agreed.

"Sure! He's all right!" Private Wilhelm nodded. "I've attended
to that."

"Come here, Carl!" called the stoop-shouldered one, in a low voice.

From another clump of bushes came another man, bearded and
bespectacled. If there's anything in a face, Carl was unmistakably
German.

"Carl will tell you what to do," said time stoop-shouldered one.

"You men are in two different companies?" asked the man behind
spectacles.

"I'm in B company," nodded Mock. "Wilhelm is in E company."

"Then you can take care of two companies of men," Carl went on.
"Do to-morrow morning what I'm going to tell you. See these?"

The bespectacled one held up two vials that he had taken from
a pocket.

"Each one of you takes one of these," he went on. "Hide them
to-night where you please. In the morning, when the men in your
barracks hang their bedding out of the windows and go down to
breakfast, stay behind. Uncork a vial, each of you, and sprinkle
the liquid in here on the bedding of at least half a dozen soldiers.
You understand? Then slip down to your breakfasts."

"What's in these vials?" asked Mock, taking the one offered him
and curiously inspecting the liquid in it.

"Germs!" said the bespectacled one. "Measles. Do as I tell you,
and in a few days measles will begin to run through the two companies
like wildfire. In a few days more it ought to be well through
the regiment. Tomorrow night slip out of camp and come here.
Under those bushes over there you'll find civilian clothing.
Understand? Yes? In the pockets of each suit you'll find the
money to pay for your work. Take off your uniforms and put on
the other clothes. Then go where you please, but be sure to keep
out of time Army afte