He felt under his tooth a hard substance, which he caught in his hand.

To his great surprise, it was a sort of blue and white stone.

He soon felt ill, and fortunately was able to vomit what he had swallowed.

Furious, and accusing me of a criminal intention, he returned to my quarters to demand an explanation.

I examined the substance taken from the banana, and found that it was blue vitriol and corrosive sublimate.