“What about the servants?” I asked.

“There are no servants excepting my housekeeper, and she is absolutely trustworthy.”

“He might have some store of the drug that you are not aware of. Is he left alone much?”

“Very seldom indeed. I spend as much time with him as I can, and when I am not able to be in the room, Mrs. Schallibaum, my housekeeper, sits with him.”

“Is he often as drowsy as he is now?”

“Oh, very often; in fact, I should say that is his usual condition. He rouses up now and again, and then he is quite lucid and natural for, perhaps, an hour or so; but presently he becomes drowsy again and doses off, and remains asleep, or half asleep, for hours on end. Do you know of any disease that takes people in that way?”