Porthos assumed an air of reserve. “Dear friend,” said he, “God preserve me from meddling with the affairs of others, above all from revealing secrets it may be to their interest to keep. When you see Aramis, he will tell you all he thinks he ought to tell you.”

“You are right, Porthos; and you are quite a padlock for safety. But, to revert to yourself?”

“Yes,” said Porthos.

“You said just now you came hither to study topography?”

“I did so.”

“Tudieu! my friend, what fine things you will do!”

“How do you mean?”

“Why, these fortifications are admirable.”