sometimes difficult to find once the body has been moved."

The doctor watched Quarles's close investigation with some amusement. The
shirt front came in for a lot of attention, and the collar was examined
right round to the back of the neck. It was a long time before Quarles
stood erect and put the lens in his pocket. I got the impression that he
had prolonged the investigation for the purpose of impressing the doctor.

"It would be virulent poison which would kill a man so quickly and while
he sat in his chair," Quarles said reflectively.

"It would, indeed," the doctor returned.

"You have formed no idea what the poison was?"

"Not yet."

"No hypodermic syringe has been found, I suppose?" said Quarles,
turning to me.

"No."

"You see, doctor," he went on, "if the glasses there show no evidence of
poison, and nothing has been moved, and you decide that poison was the
cause of death, one might jump to the conclusion that it had been
self-administered with a syringe; that is why I ask about a syringe."

"There are such things as tablets," said the doctor, "or the poison may
have been in the food he has eaten to-night."