“No,” I answered. “The symptoms are not exactly like those of any disease that is known to me. But they are much very like those of opium poisoning.”

“But, my dear sir,” Mr. Weiss retorted impatiently, “since it is clearly impossible that it can be opium poisoning, it must be something else. Now, what else can it be? You were speaking of congestion of the brain.”

“Yes. But the objection to that is the very complete recovery that seems to take place in the intervals.”

“I would not say very complete,” said Mr. Weiss. “The recovery is rather comparative. He is lucid and fairly natural in his manner, but he is still dull and lethargic. He does not, for instance, show any desire to go out, or even to leave his room.”