"Sacredieu! my dear fellow," I said to him, "that lad over there irritates me so much that I am dying to get even with him."

"Ah, try! you will have cleared up a very curious point in science."

Five minutes later, Maillan and de Longpré returned to me.

"Well," they said, "all is arranged."

"Good!"

"You are to be placed fifty yards from one another ..."

"Why fifty yards?"

"Oh come, wait a bit. And you have the right to walk fifteen yards towards one another."

"Ah!"

"You are not satisfied?"