has really been administered--and you cannot give any reliable name or
any address whatever. Then there is the question of sleeping sickness.
You reject it for medical purposes, but you could not swear, in a court
of law, that this is not a case of sleeping sickness."

"No," I admitted, "I could not."

"Then I think the police would decline to move in the matter, and you
might find that you had raised a scandal in Dr. Stillbury's practice to
no purpose."

"So you think I had better do nothing in the matter?"

"For the present. It is, of course, a medical man's duty to assist
justice in any way that is possible. But a doctor is not a detective; he
should not go out of his way to assume police functions. He should keep
his eyes and ears open, and, though, in general, he should keep his own
counsel, it is his duty to note very carefully anything that seems to
him likely to bear on any important legal issues. It is not his
business officiously to initiate criminal inquiries, but it is
emphatically his business to be ready, if called upon, to assist justice
with information that his special knowledge and opportunities have
rendered accessible to him. You see the bearing of this?"

"You mean that I should note down what I have seen and heard and say
nothing about it until I am asked."

"Yes; if nothing further happens. But if you should be sent for again, I
think it is your duty to make further observations with a view, if
necessary, to informing the police. It may be, for instance, of vital