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Rh and out of it than you would believe. No one realizes it; because the most dangerous kind are those who know them- selves that they are mad, and they hide it from other folks with the cunning that a sane mind wouldn't be capable of." She halted and drew a deep breath as if the subject were finished;  but as he maintained a noncommittal silence and permitted his expression to register nothing more than a casual interest, she suddenly advanced once more until she stood close to his chair.

"Watch people's eyes, sir, when you are on a case. Watch their eyes. It isn't that they'll be wild and shifty necessarily, but if you'll study them long enough there'll be a time when even for just a second they'll let go like a curtain that's been held together and you'll get a peep at the diseased brain back of them. They may be crafty enough to outwit you a hundred times, and cunning enough to guard their actions and their speech so that you would be called crazy yourself if you were to accuse them of anything; but they can't always control their eyes! Remember that, sir, and it will maybe help you a little sometime."

She turned as if to go but he caught her wrist.

"Wait a minute, Gerda. You've got some particular reason for telling me this. Do you mean that you know something? That someone in this house is insane?"

"Hush! Oh, hush!" She drew back and he released her. "I meant nothing. I thought only to do you a kindness, to tell you something that I had learned which might at some future time be useful to you. Forgive me, sir, if I have been impertinent and let me go. I think Mees Meade is calling me."

"You think nothing of the kind," he retorted. "You're