“Dear me, it seems hardly accessible. And yet you will observe that there is a creeper below and a water-pipe above which give some foothold.”

“I could not climb it myself,” said Mr. Bennett.

“Very likely. It would certainly be a dangerous exploit for any normal man.”

“There was one other thing I wish to tell you, Mr. Holmes. I have the address of the man in London to whom the professor writes. He seems to have written this morning, and I got it from his blotting-paper. It is an ignoble position for a trusted secretary, but what else can I do?”

Holmes glanced at the paper and put it into his pocket.