All the circumstances were subsequently so well known, that writers of the time have declared that the poison was infused into some mushrooms, a favourite delicacy, and its effect not at the instant perceived, from the emperor's lethargic, or intoxicated condition. His bowels too were relieved, and this seemed to have saved him. Agrippina was thoroughly dismayed. Fearing the worst, and defying the immediate obloquy of the deed, she availed herself of the complicity of Xenophon, the physician, which she had already secured. Under pretence of helping the emperor's efforts to vomit, this man, it is supposed, introduced into his throat a feather smeared with some rapid poison; for he knew that the greatest crimes are perilous in their inception, but well rewarded after their consummation.