“My mother, at the time of her death, and for some time before it, was taking a tonic containing strychnine.”

“Ah!” said the Coroner.

The jury looked up, interested.

“I believe,” continued Lawrence, “that there have been cases where the cumulative effect of a drug, administered for some time, has ended by causing death. Also, is it not possible that she may have taken an overdose of her medicine by accident?”

“This is the first we have heard of the deceased taking strychnine at the time of her death. We are much obliged to you, Mr. Cavendish.”

Dr. Wilkins was recalled and ridiculed the idea.