Ten Years Later: The Man in The Iron Mask by Alexandre Dumas Chapter 40 Page 21

”What a disgraceful day!”

They walked slowly the four leagues which separated them from the little wood behind which the carriage and escort were in waiting. When Fouquet perceived that sinister machine, he said to D’Artagnan, who cast down his eyes, ashamed of Louis XIV., “There is an idea that did not emanate from a brave man, Captain d’Artagnan; it is not yours. What are these gratings for?” said he.

“To prevent your throwing letters out.”

“Ingenious!”

“But you can speak, if you cannot write,” said D’Artagnan.

“Can I speak to you?”

“Why, certainly, if you wish to do so.”