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.