"Can you say to whom they were addressed?"
"There were several for Colonel Marchbanks and one for Captain Cathcart."
"Did Captain Cathcart open his letter there and then?"
"I couldn't say, sir. I left the room immediately to take his grace's letters to the study."
"Now will you tell us how the letters are collected for the post in the morning at the Lodge?"
"They are put into the post-bag, which is locked. His grace keeps one key and the post-office has the other. The letters are put in through a slit in the top."
"On the morning after Captain Cathcart's death were the letters taken to the post as usual?"
"Yes, sir."
"By whom?"
"I took the bag down myself, sir."