Doctor Cornelius said nothing for about two minutes， but stood still with his eyes fixed on Tarva and Alambil. Then he drew a deep breath and turned to Caspian.
“There，” he said. “You have seen what no man now alive has seen， nor will see again. And you are right. We should have seen it even better from the smaller tower. I brought you here for another reason.”
Caspian looked up at him， but the Doctor ’s hood concealed most of his face.
“The virtue of this tower，” said Doctor Cornelius， “is that we have six empty rooms beneath us， and a long stair， and the door at the bottom of the stair is locked. We cannot be overheard.”
“Are you going to tell me what you wouldn‘t tell me the other day？” said Caspian.
“I am，” said the Doctor. “But remember. You and I must never talk about these things except here.on the very top of the Great Tower.”