Absorbed in his studies, Barbicane, in his turn forgetful of the duel, had seen and heard nothing.
When Ardan took his hand, he looked up and stared at his visitor in astonishment.
"Ah, it is you!" he cried at last. "I have found it, my friend, I have found it!"
"What?"
"My plan!"
"What plan?"
"The plan for countering the effect of the shock at the departure of the projectile!"
"Indeed?" said Michel Ardan, looking at the captain out of the corner of his eye.